To measure surface resistivity :

1. Simply place the meter on the surface of the material that requires measuring.
2. Press the green test button. The meter will then light the appropriate LED from 10 to the power of 3 to 10 to the power of 12 Ohms per square or  insulative.

To measure resistance to the ground :

1. Simply place the meter on the surface of the material that requires measuring.
2. Insert the earth wire into the earth socket attaching the alligator clip to ground point.
3. Press the green test button. The meter will then light the appropriate LED from 10 to the power of 3 to 10 to the power of 12 Ohms per square or  insulative.
4. The meter uses precise spaced parallel bars to sense its measurements and operates with a 9-volts PP3 battery, which can last more than 40 hours of testing time. Calibration of the unit is recommended and this can be obtain by contacting your dealer.