Đồng hồ đo điện áp M.C. Miller Digital Potential Meter Kit
The DPM voltmeter (Digital Potential Meter) is designed for ease of use by meter readers and corrosion technicians alike and the voltmeter comes with an integrated RE-5 reference electrode attached for "metallic structure-to-soil" potential difference readings.
The kit also includes a test lead for electrical connection to a metallic structure.
The voltmeter offers two ranges, ±2 VDC and ±20 VDC with a 20 MΩ input impedance.
Since the voltmeter is digital, both negative and positive voltages are displayed.