DC MAGNETIC FIELD VIEWER CARD (Cat. #A1120) .......... $2.75
FILING VIEWER
Filing Viewer (Cat. #A1122) …......................…. $4.95
HALL EFFECT SEMI-CONDUCTOR
This component can be used in a circuit to open and close a contact when exposed to alternating N and S poles of a magnet. Will also work if exposed to the same pole on alternative sides of the sensor.
Schematic of an example circuit included. Part number may vary from picture. Very unique!
Hall Effect Semi-Conductor Sensor (Cat. #A402) … $2.00 each
LINEAR HALL EFFECT SENSOR
These semiconductor chips are the heart of a DC magnetometer probe. When a DC magnetic field is applied, a voltage is produce which is proportional to the strength of the field. They also be used to make a very simple DC magnetometer… schematic included! It is possible to position 3 units orthogonally and link them in series to make a “3-axis” DC magnetic field sensor. The Hall-effect integrated circuit included in each device includes a Hall sensing element, a linear amplifier, and a CMOS Class A output structure. Integrating the Hall sensing element and the amplifier on a single chip minimizes many of the problems normally associated with low voltage level analog signals. High precision in output levels is obtained by internal gain and offset trim adjustments made during the manufacturing process.
A 3-pin ultramini SIP for through-hole mount. Lead (Pb) free, with 100% matte tin plated leadframe. These devices have a quiescent output voltage that is 50% of the supply voltage. Operating Voltage: 4.5 - 6 V. Typical Sensitivity: 1.3 mV/G
Linear Hall Effect Sensor (Cat. #400) …….. $2.00 each
SMALL COMPASS
Small Compass (Cat. #A124) …............. $2.50 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!
1.75 Inch Compass (Cat. #A123) ... $2.50
MAGNAPROBE
The MagnaProbe can be used to show :
This is a very important tool for mapping the direction of field lines prior to shielding design (speaker shielding for example), and is a great teaching tool.
MagnaProbe (Cat. #A420) …………..… $14.95
(20-0-20G) MAGNETOMETER (Cat. #A142-20) .............. $29.95
This is the meter for measuring magnets, residual magnetism, and DC magnetic fields. 4½ digit display. Range is 0.1 to 19,999 Gauss. Indicates polarity too. ±1% accuracy when used in 60° to 85°F. Very tiny probe tip fits tight spaces. Simply turn it on by selecting range (0-1999.9 or 0-19,999). Zero offset knob allows up to 10 gauss zero correction. Rugged rubber boot included for meter body. Useful and simple to understand instruction sheet. Low battery indication. Uses standard 9V battery (included). Great for hobby, education, research and industry. And look at the price!
DC Magnetometer (Cat. #A157) ….... $259.00
With one button operation, just point, click, and read. Effortlessly measure DC magnetic fields between 0 and 10,000 Gauss with 2% absolute accuracy and resolution of 1 Gauss.
Doesn't need zeroing. The advanced new design does not drift. Handheld and lightweight (only 4.4 ounces). Single handed operation is easy, as the sensor is inside the case and there is no fussing with external probes or cables. Uses 2 standard AA batteries and power consumption is so incredibly low, that a single set of batteries will last you years. Each meter carries a serial number and is individually factory calibrated using a NIST traceable gaussmeter (certificate included). Recalibration is available at only a small additional cost. Only 1.1 x 2.5 x 3.7 inches, with internal probe. One year warranty. Made in USA.
NIST DC Magnetometer (Cat. #A432) ….... $379.00
Want to measure fields up to 2000 mG with 0.01 mG resolution without breaking the bank? Need to measure freight for IATA complaince? This is the meter. 4½ digit display with two ranges: +/- 1999.9 and +/- 199.99 mG. Updates three times per second. Because the Earth's ambient field is typically about 500 mG, three "offset" controls allow you to add or subtract up to 600 mG with precision of .01 mG. Therefore, the Earth's field can be subtracted out when required. If reading in the more sensitive 199.99 range, this field neutralization feature is often necessary, because the field is usually stronger than 200 mG. The wide dynamic range of the display, along with the large range of offset and high stability of the meter, allow for stable detection of small changes in a large background field. On the higher sensitivity range, changes of .01 mG can be reproducibly measured in up to +/- 800 mG of background field. On the lower sensitivity range, absolute field of 0.1 mG resolution can be measured in up to +/- 1999.9 mG of background field. The "axial" sensor is at the end of an eight-wire cable that is four feet, which means it detects the component of the field that's in the same direction as the cable points. The meter reads negative when pointing toward a magnet’s south pole and positive when pointing toward north. At only 1 mm x 0.2 mm, the active sensor area is much smaller than most other sensors, allowing very precise magnetic measurements in small areas (such as thin films) or with high gradients, when necessary. Includes ACV output jack (3Hz bandwidth). The meter also comes with a NIST-traceable certificate of calibration, a 9-volt alkaline battery, a 120 VAC adapter (North American style). One year mfr warranty. Made in USA.
DC MilliGauss Meter (Cat. #A149) …. $590.00
Versatile enough to classify magnets, measure residual magnetism, and check fields from DC circuits. Also has sensitivity to low frequency AC magnetic fields. High linearity and high accuracy (3%) with residual sensitivity up to 10 Hz. 4 ranges: 2, 20, 200, 2000 Gauss. 3½ digit display, yields 1 mG resolution (on lowest scale). Rugged detachable probe on 38 inch cable. 200 mV AC recorder output permits data logging/recording and spectral analysis. Includes a 9V battery plus AC adapter, reference magnet, and padded hard case. Made in USA. Two year mfr warranty. Choose transverse or axial probe, or save when you get both.
Hall-Effect Gaussmeter axial (Cat. #A1101-A) ............. $525.00
Hall-Effect Gaussmeter axial & transverse (Cat. #A1101-AT) ... $650.00
KILOGAUSSMETER
This is a high quality, reasonably priced digital meter & it is invaluable for reliable measurement of permanent magnets, magnetized rocks and metals, the Earth's magnetic field, 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 transverse (Cat. #A2100-T) ............... $525.00
KiloGaussmeter axial (Cat. #A2100-A) ......................... $525.00
KiloGaussmeter axial & transverse (Cat. #A2100-AT) ............... $650.00
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.
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. #A3100) ............ $750.00
All these years, we have searched for a 3-axis meter for DC magnetic fields. Now, we are pleased to supply this simple, and cost effective unit.
Rugged device connects to your PC or laptop though the COM port. Measures in X, Y, and Z axis as well as SUM mode, all simultaneously! Very simple software shows field strength in digital and graphic format. Even operates in compass mode!
Includes everything you need to get started: probe, 9 ft cable, AC/DC power converter and software. Made in USA.
3-Axis DC Magnetometer (Cat. #A451) … $895.00
For extended meter use, allows you to use plug-in power to replace the 9V battery in any meter which uses one. Saves money on batteries.
AC to 9V DC adapter (Cat. #A421) … $9.95
ORDERS: 8 8 8 - L E S S - E M F
ORDERS: 8 8 8 - L E S S - E M F
Click here to go to the handy Meter Selection Guide.
 lessemf@lessemf.com
Copyright 1996-2007, Less EMF Inc. |
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. 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"
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. Some units may have scratches from improper storage, but at this price its still a bargain. 2¾" x 3¾"
Sensitive to Magnet Polarity
These features make Linear Hall Effect Sensor ideal for use in position sensing systems, for both linear target motion and rotational target motion. They are well suited for industrial, hobby and educational applications over extended temperature ranges, from -40°C to 125°C.
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 1-3/8 inch diameter compass to quantify and compare DC magnetic fields, track down magnetized components, or evaluate magnetic shielding performance. Much cleaner than iron filings. Makes a great science fair project too. Compass must be held horizontally to operate. May look different from picture.
The perfect way to visualize the three dimensional nature of a DC magnetic field. MagnaProbe is a small magnet suspended in a gimbal mounting. The magnet's North pole is colored red, South is blue, to easily indicate polarity of the field under investigation.
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. 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 magnets. Two models in stock: -20 to +20 and -100 to +100 Gauss.
For Strong Field Applications
A coiled cable transverse probe (High Linearity Hall Generator) 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 
Our Most Sensitive DC Gaussmeter
Zero Gauss Chamber (Cat. #A3105) ......... $350.00 
Perfect for instruments or cameras. Fits plenty of stuff in a compact space. This rugged case features aluminum trim, triple riveted corners, carry handle and locking metal clamp hinges. Black hard sidewalls. Padded inside walls but no foam. 11½'' x 7½'' x 4½''.
