GROUND RESISTIVITY METER, GROUND RESISTANCE 3 POINTS 0.09-99.9KOHM 16 32V 200MA, GROUND RESISTIVITY 4 POINTS WENNER SCHLUMBERGER METHODS 0.01-99.99KOHM 16 32V, AUTOMATIC AND MANUAL FREQUENCY SELECTION 40-500MHZ, MEMORY CAPACITY 512 RESULTS, USB COMMUNICATION PORT C OPTICAL ISOLATION, RECHARGEABLE BATTERY NI-MH 9. 6V (8X1.2V), BATTERY CHARGER 220VAC 50HZ, WATERPROOF CASING IP64, INCLUDES: MEASURING ACCESSORIES KIT N P 2135.36, AEMC INSTRUMENTS, MODEL 6471 N P 2135.50