|Measuring range||Voltage||DC 0~3,999 mV|
|LCD display||Max, Min, Average|
|Input Impedance||100 MΩ||Accurate measure on any kinds of soil|
|Printer||Internal||1, 5, 10(Time)|
|Optional Function||Earth resistance Measurement mode||0~200Ω (0.1Ω)|
|Dimention||195 x 40 x 85mm|
SD-21 is a device to measure [corrosion potential] flowing to prevent corrosion of gas pipes buried underground. It has an internal input resistance of 100 ㏁ and is applied to the domestic situation where there are many granite topography, so it is the lowest in any terrain. The error allows you to measure the most accurate value.
(General competitor products have an internal resistance of 1 ㏁ or 10 ㏁, and with these low internal resistance devices, the error is large where the land resistance is high).