WL MIDGET Surface Resistance Meter is an ultra-wide range, battery operated, portable instrument for measuring Surface Resistivity and Resistance to Ground of virtually any flat surface conforming to ASTM D-257 standard method by using recommended parallel bar sensing probe. Gives simple, repeatable measurements of conductive, static dissipative, and insulative surfaces. Ranging is automatic due to the use of high-speed OP-AMP Integrated circuits being linear, with changeover points +1/2 decade on a logarithmic scale. Repeatability equals + 5%.
Operation of the WL Midget
Remove the battery compartment end panel and insert a good quality 9V alkaline battery. Hold the checker away from any surface and press the test button, the insulative red LED should light.
Place the checker onto the surface that requires testing, again press the test button and hold. The LED that illuminates constantly is the decade measured.
1 Kilohm (10 3) Green LED
10 Kilohm (10 4) GreenLED
100 Kilohm (10 5) Green LED
1 Megohm (10 6) Yellow LED
10 Megohms (10 7) Yellow LED
100 Megohms (10 8) Yellow LED
1,000 Megohms (10 9) Yellow LED
10,000 Megohms (10 10) Yellow LED
100,000 Megohms (10 11) Yellow LED
1,000,000 Megohms (10 12) Red LED
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