This handheld device provides a qualitative visual indicator of the conductivity of different solutions, acids or salts. Two brass probes can be touched to a solid substance, or immersed in a liquid, to show conductivity on green LEDs that range from 1 to 10. Each probe is 53mm long with a diameter of 3mm. Overall length of the meter and probes together is 14cm. Includes a 12V battery and operating instructions. Additional Info: Conductivity Tester Package Size(L x W x H): 6 X 3 X 2 (IN) Categories: Physics, Electricity HTS Code: 9030.31.0000 UNSPSC: 6.01049e+007 Country Of Origin: CHINA