Features： 1、Multi Detect Range: It can measure the electromagnetic field in both the extremely low frequency (ELF) range and the extremely low frequency (VLF) range. 2、Work Frequency: Specially designed to operate in the natural DC range of 0‑3Hz (sub extremely low frequency itself), including the frequencies of humans and the earth itself. 3、Easy Operation: The operation is simple and convenient. Press the button to activate it. It needs to press and hold the button to monitor the reading. 4、Detect Frequancy: The detected frequency is 50 / 60Hz (50‑1000hz‑elf) (1000‑20000hz‑vlf), and the accuracy is 5%, which is very practical. 5、High Quality Material: High quality ABS material is selected, which is impact resistant, fall resistant, wear resistant, not easy to damage, and can be used for a long time. Specification： Item Type: EMF Meter Material: ABS Product Length: Approx. 14.3cm / 5.6in Weight: Approx. 131g / 4.6oz Battery: 6F22 9V Lithium Battery, 800mAh (With Built In Battery Delivered) Package List： 1 x EMF Meter 1 x English Manual