The Instek GBM3300 Battery Meter, 300V uses AC 1kHz as the test signal and measures battery's voltage and internal resistance to 300V. This model features 3.5" TFT LCD, 4-wire measurement method, high-resolution (6-digit voltage/5-digit resistance) measurement display capability, and independent GO/NOGO determination of voltage and resistance. The GBM-3300 offers various communications interfaces, etc. to meet various types of battery measurements, ranging from single cell, battery cell, to the end product (battery), etc. to facilitate users in achieving accurate measurements at all stages of production.