The device shown is a Benetech GM3120 Digital Electromagnetic Radiation (EMF) Tester, which measures electric field and magnetic field emissions from household appliances, Wi-Fi, and electronic devices Dual Testing: Measures both electric field (V/m) and magnetic field (μT / mG) levels simultaneously with a built-in sensor.
Alerts & Controls: Features an LCD digital screen with sound and light alarms that trigger when safe radiation thresholds are exceeded.
Operation: Uses buttons for average/peak value switching (AVG/VPP) and data hold/beeper control (HOLD/BEEP)