Product description: this instrument is a portable resistance meter, specifications for 103 ohms/m 2 ~ 1012 ohms / 2 metres, accuracy ± 101/2. It is mainly used in measuring the surface resistance grounding resistance. In the measurement of the surface resistivity, as long as the instrument on measuring surface, press the red button to test. Then instrument will light up 103 ohms/m 2 ~ 1012 ohms/m 2 range corresponding lamp or insulation. In the measurement of grounding resistance, repeat the process, also be the place plug into the socket of connecting up. Product features: application: anti-static laser-particle workshop, use Specifications: Size: 130mm 70mm x x mm Power supply: the 9V alkaline batteries