1Low frequency electromagnetic waves emitted by specific objects or devices can be detected. 2Can be used for power cord, display screen, TV, audiovisual equipment or electromagnetic oven related electrical equipment. 3Detect undesirable substances in the living environment and avoid them in time to build a wall for good health. 4Applicable frequency of 30Hz~400Hz, widely applications, handheld use, easy operation. 5Measurement Range: 0.1~400mG(milligauss),1~400mG(Milligauss), high efficiency and accurate. Condition: 100% Brand New Item Type: Magnetic Field Strength Meter Material: 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/60Hz Applicable Frequency: 30Hz~400Hz Out of Measurement Range: DISPLAY "OL" on LCD Sampling Rate: 2 times per second Working Environment: Temperature: 0~50 (32~122F) Relative Humidity: 80%RH Size: Approx. 14 x 7 x 3cm / 5.5 x 2.8 x 1.2in 1 x Detector 1 x Manual 1 x Storage Box