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 Model DPM Potential Meter  
Designed for use by non-technical personnel, such as crews, servicemen, meter readers, etc., but also suitable for the most experienced engineers and technicians. 
20 megohms input resistance practically eliminates low potential readings caused by resistance in the external circuit due to contact resistance of the reference electrode. This condition is frequently encountered in city work and in frozen ground.  | 
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 Features  
Low cost  
Rugged  
Easy-to-use  
Structure to earth potentials  
+ 2 V and + 20 V ranges  
Low-battery display  
Optional electrode extension   | 
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 Digital meter, auto-polarity +2 V, +20 V  | 
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 Specifications  
Large 1/2" LCD digits.  
Weatherproofed neoprene gasket.  
20 MΩ input resistance.  
Solid state impedance amplifier.  
Operates on one small 9 V transistor battery. 
Low drain - long shelf life. Battery easily replaced and readily available. Automatic low-battery indication on display.  
Push one button to read +2 V; push two 
buttons to read +20 V while taking reading. Digital readout: +1.999 V or +19.99 V.  
Filter eliminates errors caused by AC. 
Up to 50 volts, 50/60 Hz. Operating temperature: -4°F to 185°F.  
Molded PVC housing.  
Plastic carrying case with resilient padding  
Modular construction  
Weight: about 3 lbs.  
Size: 2 ½" deep x 10" long.   | 
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