Measuring Range
VoltageDC 0~3,999 mV
DC 0~399.9V
AC 0~599.9V
(DC: ±0.4%, AC: ±1%)
Current0~1,999 Ma (±1%)
Resistance0~1,999 Ω
0~1999 MΩ (±0.5%)
Frequency0~9,999 Hz
10~50 kHz
LCD displayMax, Min, Average
Input Impedance100 MΩ
Optional FunctionGround Resistance Test
0~200Ω (0.1Ω)
200~2,000Ω (1Ω)
Dimention195 (W) X 85 (D) X 40 (H)
The Cathodic Protection Monitor is the first product Sundoo has ever developed and localized in Korea. This instrument is used for measuring electric field potential for the purpose of corrosion prevention on buried pipelines. SD-21 shows an outstanding performance track record over other competitors and has set the high-water mark for accuracy and reduction of distorted readings. The superiority of SD 21 has been well established by its ability to measure voltage, current, earth resistance, and frequency concurrently. The device does exceptionally well in the granite environment of Korea which requires input impedance 100 ㏁, setting it apart from its competitors.