SELF-CALIBRATION FOR OPTIMAL PERFORMANCE: Our Electricity Tester Measuring Instrument utilizes the ASTM standard D 257 parallel grid induction method and features self-span calibration with a high-speed OP AMP. ACCURATE SURFACES RESISTANCE MEASUREMENTS: Our Surfaces Resistance Tester is designed to meet ANSI ESD S20.20, IEC61340 5 1, JESD 625 B, CECC, ASTM, and UL tester procedures, ensuring reliable and precise measurements according to anti-static standards. VERSATILE FUNCTIONALITY: This Handheld Electrostatic Static Resistivity Meter serves the main purpose of measuring the resistivity and grounding resistance of various materials. MULTIPLE APPLICATIONS: From engineering and maintenance to quality control, incoming inspection, manufacturing, and training, our Surfaces Resistance Tester finds its use in a wide range of industries. USER-FRIENDLY OPERATION: With its easy one-key operation, this tester simplifies the measurement process. Start your measurements with just a of a button. The intuitive design, combined with high accuracy and strong reliability, makes it suitable for both experienced professionals and beginners alike. Item Type:Surfaces Resistance Tester Battery:1 x 6F22 9V battery, 800mAh capacity (shipped with matching battery) Continuous Working Time:More than 40 hours Measuring Temperature Range:40℉ to 120℉ (5℃ to 49℃) Measurement Humidity Range:5% to 90% (more than 65% affect the measurement accuracy of the instrument) Color:As Shown Material:Plastic Package Contents: 1 x Surfaces Resistance Tester 1 x Ground Wire 1 x Battery 1 x English instruction manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.