1、Low frequency electromagnetic waves emitted by specific objects or devices can be detected. 2、Can be used for power cord, display screen, TV, audio‑visual equipment or electromagnetic oven related electrical equipment. 3、Detect undesirable substances in the living environment and avoid them in time to build a wall for good health. 4、Applicable frequency of 30Hz~400Hz, widely applications, handheld use, easy operation. 5、Measurement Range: 0.1~400mG(milligauss),1~400mG(Milligauss), high efficiency and accurate. 1 x Detector 1 x Manual 1 x Storage Box  Condition: 100% Brand NewItem Type: Magnetic Field Strength MeterMaterial: ABS.Power Supply Mode: 9V /6F22 batteries (not included)Measurement Range: 0.1~400mG(milligauss),1~400mG(Milligauss) 0.01~40uT(Microtesla), 0.1~400uT(MicroTesla)Accuracy: ±(3% RDG +3digits) at 50Hz/60HzApplicable Frequency: 30Hz~400HzOut of Measurement Range: DISPLAY "OL" on LCDSampling Rate: 2 times per secondWorking Environment: Temperature: 0~50℃ (32~122°F)Relative Humidity: ≤80%RHSize: Approx. 14 x 7 x 3cm / 5.5 x 2.8 x 1.2in