Projekt Elektronik FM 302 Teslameter (Gaussmeter) | DC/AC (RMS) magnetic fields, 2 µT–20 T ranges depending on probe, 0.1% accuracy, USB and analog output
PROJEKT ELEKTRONIKFM 302
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Projekt Elektronik FM 302 Teslameter (Gaussmeter) | DC/AC (RMS) magnetic fields, 2 µT–20 T ranges depending on probe, 0.1% accuracy, USB and analog output

Projekt Elektronik FM 302 Teslameter: DC/AC Magnetic Field Measurement Overview The FM 302 is a handheld teslameter from Projekt Elektronik of Germany. With AS active Hall probes it measures DC magnetic fields (including N/S polarity) and AC magnetic fields (true RMS). Probes are available in transverse (T) and axial (A) versions; they are factory

DC and AC (true RMS) fields; units T, G, Oe, A/m, A/cm3 manual ranges per probe; 2 µT–20 T by probe class (calibrated up to 12 T)DC error < 0.1% ±2 digit (x1); USB; BNC analog output; 9 V battery 20+ h
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One-year manufacturer warranty
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Overview

Projekt Elektronik FM 302 Teslameter: DC/AC Magnetic Field Measurement

Overview

The FM 302 is a handheld teslameter from Projekt Elektronik of Germany. With AS active Hall probes it measures DC magnetic fields (including N/S polarity) and AC magnetic fields (true RMS). Probes are available in transverse (T) and axial (A) versions; they are factory calibrated and ready to measure when plugged in, with no zeroing or scale adjustment needed. Probes are purchased separately and selected by range class. Functions include minimum, maximum, absolute maximum, relative mode and digital filtering; results can be transferred to a PC via USB, and the BNC analog output can feed an oscilloscope or control system.

Key Specifications

  • Measurement modes and units: DC (average, with N/S polarity), AC (true RMS); T, G, Oe, A/m, A/cm
  • Ranges: 3 ranges per probe (x1, x10, x100), switched manually; by probe class: High 20 T / 2 T / 0.2 T (calibrated up to 12 T), Normal 2000 / 200 / 20 mT, Low 200 / 20 / 2 mT, Very low 20 / 2 mT / 200 µT, Ultra low 200 / 20 / 2 µT
  • Display and resolution: 4½-digit dual-line LCD (±25100 digit); resolution 1/20000 of full scale of each range
  • DC error: At 23 ℃ ±1 ℃ after zeroing: < 0.1% ±2 digit (x1), ±5 digit (x10), ±20 digit (x100)
  • Bandwidth: DC measurement ≥ 100 kHz (-3 dB); AC from below 5 Hz to above 100 kHz (depending on probe)
  • Output and interface: BNC analog output ±2.7 V, DC to above 100 kHz; USB-B (virtual serial port, ASCII commands), control software included
  • Power: 9 V alkaline battery, 20 hours or more; optional 9 V adapter; can also be powered via USB
  • Dimensions, weight and environment: 166 × 88 × 31 mm; 225 g without battery; operating temperature +5 to +50 ℃

Applications

  • Magnetic field measurement of permanent magnets, motors and magnetic components.
  • Residual magnetism checks after demagnetization and AC magnetic field measurement.

Specifications per the Projekt Elektronik Teslameter FM 302 data sheet (version 0204-2.1, 2021-10-20) and the AS active probe data sheet (0203-5.5, 2025-05-23) (projekt-elektronik.com, retrieved 2026-10-24).

Specifications

Key specifications
DC and AC (true RMS) fields; units T, G, Oe, A/m, A/cm3 manual ranges per probe; 2 µT–20 T by probe class (calibrated up to 12 T)DC error < 0.1% ±2 digit (x1); USB; BNC analog output; 9 V battery 20+ h
Model
FM 302
Brand
PROJEKT ELEKTRONIK
Purchasing
In stock, tax incl. / B2B formal quotation request (RFQ)
Warranty
One-year manufacturer warranty

Calibration

If your instrument needs periodic calibration, register the brand, model and calibration requirements on the calibration service page and we will send a separate quote.

Go to calibration service