Overview: Welcome to use the product BM500A is a digital insulating resistance tester. Output test voltage can be switched among 250V/500V/1000V, The measurement range of the meter can reach up to1999M. The product is applicable to measurement of the insulating resistance of various insulating materials and electric equipments such as ransformers, motors, cables, switches, and electric apparatuses. It is also applicable to maintenance, test, and inspection of various lectric equipments. It is compact in structure, convenient to carry, and an ideal electrical and electronic testing meter of yours. General characteristics: (1) Auto range: 1 will be displayed for overload (2) Display mode: Liquid crystal display; maximum display: 1999 (3) Sampling rate: 2.5 times per second (4)The meter can display actual insulation test voltage. LED light is used to indicate high voltage output status (5) Operating environment: 0-40, less than 75%RH (6) Storage environment:-10-60, less then 80%RH (7) Indication for insufficient battery capacity: - + is displayed (8) Power Supply: 9V battery Not included (9) Operating Temp: 0 to 40 (relative humidity <75%) (10) Storage Temp: -10 to 50 ((relative humidity <85%) (11) Dimension: 69x138x31mm(with holster) (12)Weight: approx. 170g (including battery) Specification: Rated voltage: 250V/500V/1000V Open circuit voltage: 90%~110% of the rated voltage Measurement range: 0.001~1999M Minimum Resolution: 0.001 M Accuracy: (5%RDG+5) The measurement resistance value that can maintain lower limit of the rated voltage: 250V: about 500k; 500V: about 1.5M; 1000V: about 5M short circuit current: Not less than 1.5mA Package including: 1 x BM500A Insulation Resistance Tester 1 x English nstruction manual 2 x Test line (red and black) _x000D_