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When you require accurate measurement of resistance or resistivity over a wide range, the Model 870A resistance indicator is an excellent choice. It offers the precision specified in EIA, ASTM, military and ESD Association standards, and other applications requiring measurements over the range of 100 ohms to one teraohm, using test voltages of 10 and 100 volts. Accessories that come with the rental unit are the Model 850 resistance probe, used to perform point-to-point measurements on floors and work surfaces, and the Model 870M analog meter which reports exact values. The instrument itself indicates pass/fail with visual and audible alarms.

Key Features

  • Accuracy better than five percent
  • Measures resistance from 10 to 10 ohms

Technical Specifications

Resistance Range 102 to 1011 ohms
Surface Resistivity Range 103 to 1012 ohms/sq
Range Selection 9-position rotary switch, 1 decade per position
Accuracy ± 2% 10 to 107 ohms ± 5% 108 to 1011 ohms
Open Circuit Test Voltage 10 volts ± 2% 100 volts ± 2% (from 104 ohms)
Power Two 9V alkaline batteries


  US Metric
Dimensions 6.5 x 3\" x 5.25\"\" 165 x 76 x 133 mm


  US Metric
Weight 5 lbs 2.2 kg