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Lightweight tester is designed for measuring surface resistivity in ohms per square according to parallel resistivity probe method ASTM D257. The unit shows values through an LED scale that is coded with colors to signify Conductive, Dissipative, and Insulative ranges. A colored "Warning" stage indicates that the material is at the higher end of the Dissipative range, and is close to being out of specification. Half decade measurements provide greater accuracy by giving a closer indication to the measurement value. Each unit includes a 9-volt battery, case, two cables, and calibration certificate. When combined with the ACL 5 lb. weight kit, will comply with: IEC 61340-4-1, ANSI/ESDA S4.1, and ANSI/ESDA S7.1.