Tel: +1-518-608-6479          EMF Educational &  
Build-It-Yourself Kits  
Student Projects, Science Fair, School Supplies, Teaching Aids    
Home > EMF Kits      search by part numberSearch by Part Number          E-mail    Fax/mail order form     Cart      
Educational EMF Kits
Whether teaching electricity, magnetism, or electronics in the classroom, or a science fair project or self-teaching, you will find the right equipment for the task.

What do you want to do"

Detect or characterize DC magnetic fields: DC Magetic Field Devices
Detect or quantify AC magnetic fields: AC Magetic Field Devices
Shield Magnets: Magnetic Shielding Alloys
Measure frequency, current or voltage: DMM, O-scopes, and Frequency Counters
Create frequencies: Signal Generators
Teach/Learn circuit soldering and asembly: Assembly Kits
Make unique wearable electronics: Conducitve fabrics, threads and switches
Ideas for lessons, experiments: Experiment Books

  DC Magetic Field Devices


Seeing Is Believing

Viewer Card Finally, a way to actually "see" DC magnetic fields from permanent magnets or magnetized metals without messy iron filings! You can use this amazing film over and over to view the location and number of poles on any magnet. Just lay the card on the magnet to see the polar pattern. Magnetic poles appear as dark areas and the light areas represent where the N and S poles meet. Flexible thin rubber magnets show up as stripes. A great inexpensive magnetic detector for finding objects in your environment that have become magnetized. Uses no batteries. Also great for science projects. Dimensions: 2-1/2" x 4"

DC MAGNETIC FIELD VIEWER CARD (Cat. #K1120) .......... $2.75 add to cart
Case Price [50 units] (Cat. #K1120-case) .................................. $123.50 add to cart

Viewer Gel

Magnetic Field Viewer Gel

Same flat viewer material that is in the viewer card but larger (full 12" x 12") and without the lamination. Can be re-used over and over. Can be cut to custom sizes with a scissors, bent or rolled. For DC magnetic fields only.

Paper-thin and highly flexible, this viewer uses micro-encapsulation of colloidal Nickel to reveal magnetize material. In the encapsulation process, colloidal Nickel particles suspended in the slurry become engulfed within gelatinous membranes. A 2-mil layer of the magnetically sensitive slurry is bonded to a 5-mil sheet of plastic film and allowed to dry. After complete drying, the particles maintain freedom of movement within the gelatinous membranes.

When a DC magnetic field is applied to the finished film, the Nickel particles congregate in alignment with the flux lines emanating from the DC magnetic source. This clumping of nickel particles causes a darkened appearance in the film exactly where the magnetic field is impinging on the film. As a result, an exact two-dimensional image or impression of the magnetic pole or pole pattern (if there are more than one) is produced. This image is easily erased once the film is removed from the magnetic source and the nickel particles are allowed to freely re-disperse within their gelatinous cells. A common bar magnet can be swiped across the film to ensure complete erasure of the previous image, or by reapplying the film to another magnetic source the new image produced will completely replace the old one.

Because of the small size of the colloidal Nickel particles, the film can detect fields as low as only a few gauss and still produce a clear image.

Due to the film's high flexibility, it easily conforms to magnetic surfaces with high degrees of concavity and convexity. Also, because the film is so thin and can be cut down to practically any size without losing its properties, it can be used in tighter places inaccessible to the bulkier, unalterable devices. Finally, since there are no moving or electronic parts, the film never needs maintenance or repair.
DC MAGNETIC FIELD VIEWER GEL (Cat. #K1121) .......... $59.00 add to cart


Filing Viewer Remember playing with iron filings and a magnet" The magnet makes the filings stand up on end and arrange themselves in beautiful patterns according to the magnetic field lines. The problem was that the filings would stick to the magnet so hard it was difficult to remove them AND filings that spilled made a huge (and rusty) mess. This clever device solves both problems by enclosing the iron filings in a clear hard plastic case! Now students, children and adults too can enjoy learning about magnetic attraction the fun and clean way. You must supply your own magnet, but just about any magnet will do. And when you are done, just put it away in a drawer and there's nothing to clean up. 3" round.

Filing Viewer (Cat. #K1122) ............................. $4.95 add to cart


1.75 Inch Compass Looking for the cheapest way to determine if something is magnetized" Want a simple device for comparing magnets" Doing a school project" Lost" For hundreds of years, mankind has used the trusty compass to guide him through the Earth's magnetic field. Measure the deflection of the needle from magnetic North at known distances using this nice 1.75 inch diameter compass to quantify and compare DC magnetic fields, track down magnetized components, or evaluate magnetic shielding performance. Extra large, easy to hold, and very easy to see. High resolution with large needle. Aluminum case with loop for key ring or lanyard. Check DC magnetic fields, identify magnetized steel, or just find your way home! Much cleaner than iron filings. Makes a great science fair project too. Compass must be held horizontally to operate. May look different from picture.

1.75 inch Compass (Cat. #K123) ................ $2.50 add to cart


Industrial Magnetic Strength Meter

Pocket Magnetometer DC magnetic fields can develop in many steel or iron objects if they have been exposed to magnetic fields, current, or friction. Even structural members in homes and barns have become magnetized due to stray voltage. Pocket Magnetometer This hand-held device detects residual magnetism in steel parts quickly and accurately. Simply place the test edge near or against the object being tested, and the needle gauge points to a reading representing the magnetism in the object at that site as well as polarity. Will also verify thoroughness of de-magnetizing. Check out your car, bed frame, desk furniture or any other metal objects you spend time with. Can also be used to check the strength of (weak) magnets. Two models in stock: -20 to +20 and -100 to +100 Gauss.

(20-0-20G) MAGNETOMETER (Cat. #K142-20) .............. $65.95 add to cart
(100-0-100G) MAGNETOMETER (Cat. #K142-100) ...... $165.00 add to cart

Other ranges available as a special order. Contact us for details.


Two High Sensitivity Meters in One AC/DC milliGaussmeter

A useful and reasonably priced meter for measuring both AC and DC magnetic fields. Easy to use with external single axis axial probe. Excellent range with great features including:

  • DC and AC (40 Hz to 10 KHz) magnetic field measurement
  • High sensitivity: down to 0.1 mG
  • High range: up to 3000 mG
  • Accuracy: ±(2% + 2 mG)
  • N pole/S pole indicator
  • Reads in mG or µT (toggle)
  • Zero adjustment button (tare) for relative measurement
  • Data hold function for freezing the current value on display
  • Records Maximum and Minimum readings with Recall
  • 1 second sampling time
  • 3.5 mm data ouput jack

Uses 6 AAA batteries (not included). Can also be power by external DC 9V adapter (sold separately).

AC/DC milliGaussmeter (Cat. #K112) ..... $399.95 add to cart


Kilo Gaussmeter For Strong Field Applications

This is a high quality, reasonably priced digital meter & it is invaluable for reliable measurement of permanent magnets, magnetized rocks and metals, and any DC magnetic field. Offering 3½ digit bipolar display, 9V battery powered and comes with an AC power adapter for extended benchtop use. KiloGaussmeter Frequency Response Probe (High Linearity Hall Generator) with 3.5 ft cable is included providing nearly linear response from DC to 10 Hz. Useful 4 ranges covering 0 - 20, 200, 2000, 20,000 Gauss with a 3% accuracy guarantee. Two year parts and labor warrantee. 200mV DC recorder output (which can be used with DMM (Cat. #A192) to interface this unit with your PC) is included. Choose transverse, ultra-thin (.020 inch) transverse, axial probe, or combination.

Ultra Thin Probe A T Probe orientation KiloGaussmeter with transverse probe
- (Cat. #K2100-T) ...................... $525.00
add to cart

KiloGaussmeter with ultra-thin transverse probe
- (Cat. #K2100-UT) ................... $525.00
add to cart

KiloGaussmeter with axial probe
- (Cat. #K2100-A) ...................... $525.00
add to cart

KiloGaussmeter with axial & transverse probes
- (Cat. #K2100-AT) .................... $650.00
add to cart

Connector Cable
Perfect for connecting the output on this meter to a DMM with PC Interface for data logging and graphics. 3.5 mm mono audio plug on one end, dual banana plug on other end.
3.5mm Audio Plug to Dual Banana Connector Cable (Cat. #3.5-Ban) ........ $14.95 add to cart


Geomagnetometer Our Most Sensitive DC Gaussmeter

You simply won't find anything this sensitive in this price range! Want to measure the Earth's magnetic field with great precision" Want to detect magnets from a distance" Breaks in magnetized steel cables" Need to comply with shipping regulations" Then this is the unit for you. Similar in appearance to the DC Gaussmeter listed above, but 10,000 times more sensitive. Only 3" x 4" x 7" and operating on common 9V batteries for total portability and convenience plus AC power adapter included for extended benchtop use. Geomagnetometer

An axial probe (High Sensitivity Hall Generator) with coiled cable is included providing nearly flat response from DC to 10+ Hz. Large 3½ digit bipolar display. 4 ranges: 0-2, 20, 200, 2000 mG (yes milliGauss!) and a 5% error guarantee. Two year parts and labor warrantee. 200mV AC recorder output included to interface this unit with your PC, scope, analyzer or recorder. Allows analysis of ultra-low frequency signal waveform, frequency and spectrum. Click here for more information.

Geomagnetometer (Cat. #K3100) ............ $750.00 add to cart

Connector Cable
Perfect for connecting the output on this meter to a DMM with PC Interface for data logging and graphics. 3.5mm mono audio plug on one end, dual banana plug on other end.
3.5mm Audio Plug to Dual Banana Connector Cable (Cat. #3.5-Ban) ........ $14.95 add to cart

Zero Gauss Chamber Zero Gauss Chamber (Cat. #K3105) ......... $395.00 add to cart

Click for even more DC Gaussmeters

  AC Magetic Field Devices

Magnetic Pickup


Build Your Own Gaussmeter

This AC magnetic field probe generates an AC voltage when exposed to AC magnetic fields. Although we do not specify how the output from this unit varies with frequency, we do know that the greater the magnetic field, the higher the voltage generated (at 60 Hz, it produces about 1 mV per 20 mG). It can be connected to a DMM, analog voltmeter, oscilloscope, audio amplifier, or recording device. Connect 3 of them in series and create a 3-axis unit. It can also be used in reverse: apply a small current to produce a magnetic field (careful, don't overdo it). It is quite small: only 0.7" long x 0.7" diameter, with a removable rubber suction cup attached. Has 36" lead and 1/8" (3.5 mm) mono plug.

Magnetic Pickup (Cat. #K40175-PU) ............... $4.95 add to cart


Listen to Magnetic Fields

Budget Buzz Stick Common ELF magnetic field frequencies are within the range of human hearing. This simple set up converts the AC magnetic signal directly into a dramatic corresponding sound signal. A 60 Hz powerline field sounds like a 60 Hz hum (a low note on piano keyboard). Harmonics can easily be heard, as well as clicks, static, and hash. LED displays are especially noisy. The strength of the field is proportional to loudness.

Unit includes a single axis probe on 3 foot cable and audio amplifier. You can even use an optional earphone/headset for discreet operation. Use it to "sniff out" sources of interference, offending EMF, check shielding designs. Makes a great educational tool. Requires one 9V battery.

Budget Buzz Stick (Cat. #K40175-B) .................. $21.95 add to cart

Gauss Master


Popular EMF Meter with Sound

This little meter measures the level of ELF magnetic field radiation from power lines, computers, kitchen appliances, and more! The easy to read scale, unique built-in audio signal and auto shut-off make it simple to use and a great way to find hidden sources of ELF frequency magnetic fields.

Most experts agree that chronic exposure to more than 2.5 milli-Gauss is inadvisable. This meter will show you which areas are above or below 2.5 milli-Gauss in the 50 - 60 Hz frequency range.

Hand-held, lightweight and durable, with two easy to read scales (0-1 mG, & 0-10 mG), and dramatic audio signal. Our favorite meter for demonstrating the presence of dangerous EMFs to others and paranormal work. Requires one 9V battery (not included). Calibrated at 50-60 Hz.

10-1 mG
0-10 mG
0.1 mG
1 mG
50/60+ Hzno spec
What is unique about this meter" Lightning fast needle response, audio function

Includes nice instructions on how to perform
a proper survey of your home, office, or school yard.

Gauss Master (Cat. #A130) .................................. $35.95 add to cart

Case Price [48 units] (Cat. #A130-case) ............ $960.00 add to cart

Quick Start Instructions for GaussMaster (pdf)

Click for even more AC Gaussmeters


Click for Conductive Fabrics and Textiles

  Signal Generators

BNC Breakout Gator

BNC Breakout Cable

36 inch long, BNC male one end, booted alligator clips on other end. Permits easy connection from most devices to input or output of signal generator.

BNC Breakout Gator (Cat. #K462-G) .............. $5.95 add to cart

BNC Cable

BNC Cable

Choose desire length: 12 inch or 36 inch long coaxial, BNC male connector on each end.

BNC Cable 12 inch (Cat. #K128-BNC-12in) ............ $1.95 add to cart
BNC Cable 36 inch (Cat. #K128-BNC) ............ $4.95 add to cart

Frequency Generator


"Low Frequency Test Signal Generator"

Make some waves! Need a source of 20 Hz to 150 kHz frequencies" Handy little unit fits in your shirt pocket and is very simple to operate. Produces nice clean sine waves (adjustable intensity up to 1.2V rms) or square waves (p to 8V p-p) with 5% frequency accuracy. Simply dial in the desired frequency. Uses 9V battery (50 hrs typical use). Includes low battery indicator, test leads and 9V battery.

Check the response of your gaussmeter to various frequencies (connect the Frequency Generator to the Degaussing Coil to generate several mG fields at various frequencies), test your frequency counter, connect to a speaker/headphones to test your hearing range! Also great for field/bench service of audio equipment, car stereo, etc. Bargain price!

Generator frequency20Hz~150KHz in 46 steps ±0.5dB
Sine wave output1.2V RMS minimum in 600 Ohm
Distortionless than 0.05% (200Hz~15KHz)
0.1% (50Hz~30KHz)
less than 0.3% (20Hz~100KHz)
Square wave output8V p-p max. (no load)
Rise/fall timeless than 0.5µsec
Overshootless than 2%
Duty ratio50% ±5%
Output impedence1 KOhm
Dimensions3 3/8" (W) x 6" (H) x 1" (D)

Frequency Generator (Cat. #K423)....... $74.95 add to cart

  Magnetic Shielding Alloys


High Saturation Magnetic Alloy

Magnet Shield

First line of defense for shielding strong magnetic fields from magnets, speakers, small transformers and motors. Strong magnetic fields are harder to shield because they tend to "saturate" the shielding material. This 4" wide foil is a hefty .010" thick and has an exceptionally high magnetic saturation of 21400 Gauss and maximum permeability of 4000. Tin plated for excellent corrosion resistance and better conductivity, it can be soldered or painted.

MagnetShield typically reduces fields up to a factor of 2 or 3 depending on size/shape of the shield. Can be used in multiple layers, and/or in combination with a higher permeability alloy such as Joint-Shield for higher attenuation. Annealing is not necessary with this material. Compare the magnetic shielding of various houshold items: Aluminum pie plates, steel cookware, Silver spoon etc.

For increased shielding effectiveness, consider the following strategies:

  • Good: Layer(s) MagnetShield
  • Better: One or more layers of MagnetShield (closest to the source of field), followed by one or more layers of a high permeability material such as Joint-Shield or MagStop Plate.

Applications Notes:

- The magnets will be attracted to the shield (this is true of ALL magnetic shielding alloys). If you want to shield 2 adjacent magnets from eachother, each magnet should have its own shield.
- The size, shape, and position of the shield all matter in terms of shield performance. For example, larger shields are better than small shields. Closer to the magnet is better than farther from the magnet. And parallel to the magnetic field lines is better than perpendicular to them.
- You will likely need more than one layer of shielding material, depending on the strength of your magnets. More layers = more attenuation.

How do I stop the attraction/repulsion between 2 magnets"

Click here for Specs on Magnet Shield

4 inch wide Ribbon:
MagnetShield (Cat. #K274) ........................... $4.50/lin ft add to cart



Breakthrough In Magnetic Shielding Flexibility

GIRON Magnetic Shielding Film, which does not contain Nickel, is unlike any other magnetic shielding material available on the market today. Suitable for high field strength applications requiring high saturation and good permeability, it is both thin and strong, and unlike Mu-metal™ it is very tolerant to bending or shaping without losing its shielding properties.

GIRON GIRON is a woven, laminated material. Cuts neatly with snips or sheet metal tools, and can be used either flat or molded into shapes for best performance.

Suitable for small shields on magnets, motors, speakers and appliances such as refrigerators, vacuum cleaners etc. Also great for lining car floor or firewall. Perfect for full or partial wall / floor shielding in rooms too! Can be glued, taped, nailed, screwed or riveted into place. Could even be used to make a (heavy weight) vest to shield a person's torso! Works with AC or DC magnetic fields (0-1000 Hz), and will tolerate temperatures from 32° to 122°F. Coating is UV sensitive, cover if installation is exposed to direct sunlight.

  • Initial permeability: 500
  • Relative permeability: 7000
  • Saturation induction: 2,0 T
  • Curie Temp.: 740°C (1364°F)
  • Weight is approx 1 lb per square foot

25.5 inch wide, 1 mm thick. Weighs 3.5 Kg/m² (about 15 pounds per 10 foot length). Edges are sharp!

GIRON (Cat. #K273) ............... $48.95 per linear foot add to cart

Click for even more Magnetic Shielding Alloys

  Assembly Kits

Deluxe Instrument Case

Deluxe Instrument Case


Perfect for meters, instruments or cameras. Fits plenty of stuff in a compact space. This rugged case features aluminum trim, riveted corners, lock and keys, carry handle and metal hinges. Black hard sidewalls. Black padded inside walls but no foam. Outside: 12'' x 10'' x 4''; Inside: 11" x 9¼" x 3¼".

You can also use it to store:
important papers seeds toiletries knitting / sewing supplies
crayons / chalk photos coupons medicines / vitamins / homeopathy
hand gun / ammo tools collectibles art / craft supplies
cash / valuables diary love letters small toys, Legos, puzzles
business cards lunch receipts baseball cards

Deluxe Instrument Case (Cat. #A711) .............................................. $19.95 add to cart

Deluxe Instrument Case

Deluxe Instrument Case

Foam Inserts


Sized to Fit Deluxe Instrument Case and Customizable

If you like your equipment cradled in supporting foam, these pre-scored foam inserts fit perfectly in the Deluxe Instrument Case above. You get 3 pieces: Upper egg-crate, lower egg-crate, and a middle customizable 1 inch thick piece with 1/2 inch pre-scored lines. Just trace the outline of your equipment on the back side and punch out as many 1/2 inch squares necessary to cradle the equipment perfectly. Even the egg-crate pieces can be cut with a scissors or sharp blade. Nice professional look too.

Foam Inserts (Cat. #A712) .............................................. $10.00 add to cart



Ready to Go, Right Out of the Box

With so many meter choices, it can be hard to know what you need to do a proper EMF survey of your home or office. To save you the trouble, we have put together a kit that does everything you will need to check your home for unsafe levels of electromagnetic fields including wifi, smart meters, fluorescent lights, circuit boxes, wiring, appliances, computers and TVs, cellphones, and so much more. We have selected equipment that is easy to use, reliable, and reasonably priced.
EMF Survey Kit

    With this kit, you can measure:
  • Dirty Electricity
  • Low frequency magnetic fields
  • Low Frequency electric fields
  • High frequency (radiowaves)

    You get:
  • Acousticom2 (measures RF)
  • Pocket PF Meter (measures E and M fields)
  • Stezerizer Microsurge Meter (measures dirty electricity)
  • And a foam lined, professional-looking, locking carry case.
A $484 value, you save $40!

Home Survey Kit (Cat. #A141-kit) ..................... $444.80 add Personal EMF alarm to cart

  Great Books for Experiment Ideas

Safe & Simple Electrical Experiments

Safe & Simple Electrical Experiments by Rudolf F. Graf

Here are 101 entertaining experiments for fast and reliable learning of the basic principles of electricity. Categorized into static electricity (38 experiments), magnetism (32), and current electricity and electromagnetism (31) for maximum exposure to the fundamentals. Each experiment beginning with a list of safe and inexpensive materials needed and some introductory remarks, is presented with detailed step-by-step instructions and clear illustrations. The reader learns where to get/make electricity, how to store it, and how to use it in a number of creative ways. Although carefully selected to be safe for children, this book is suitable for young and old students of electromagnetism. 117 paperbound pages. 1964

Safe & Simple Electrical Experiments (Cat. #K593) ..................... $11.95 add to cart

Click for even more books about Electromagnetism

Home Go To Checkout
776B Watervliet Shaker Rd      Latham NY 12110-2209      USA
Order Toll Free: (8 8 8) 5 3 7 - 7 3 6 3
International: +1   ( 5 1 8 )   6 0 8 - 6 4 7 9
Fax: +1   ( 3 0 9 )   4 2 2 - 4 3 5 5

Send E-Mail to Less EMF

home emf

Copyright 1996-2020, Less EMF