Tenmars TM-191 Magnetic Field (EMF) Meter, 30-300 Hz
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Prices updated: 13 Oct 2026
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About this product
The Tenmars TM-191 measures extremely low frequency (ELF) magnetic fields from 30 to 300 Hz, such as those from power lines, appliances, air conditioners and monitors. It has a single-axis sensor, a 3½-digit LCD reading up to 1999, and two ranges: 200/2000 mG and 20/200 µT. It runs on a 9 V battery.
Specifications
- Frequency range
- 30-300 Hz
- Measuring range
- 200/2000 mG, 20/200 µT
- Resolution
- 0.1/1 mG, 0.01/0.1 µT
- Accuracy
- ±(2.5% + 6 dgt) at 50/60 Hz
- Display
- 3½-digit LCD, max reading 1999
- Sensor
- Single axis
- Battery
- 9 V
Frequently asked questions
Can I use it to measure RF fields from Wi-Fi or phones?
No. Although the title mentions RF field strength, the listing specifies a frequency response of 30 to 300 Hz, which covers the extremely low frequency range. It is not designed for radio-frequency measurement.
What is the difference between mG and µT?
Both are units of magnetic flux density. 1 µT equals 10 mG, so the 200 mG range corresponds to 20 µT and the 2000 mG range corresponds to 200 µT.
