Capacity counter for 12V 24V 48V batteries   Features  Bi-directional power recognition for charge and discharge detection You can recognize easily bidirectional power features The direction of the link does not need to be adjusted Power off the power saving function,after power off the number of AH and WH can be saved earlier shutdown. Practical for observing and measuring. The display function of time and AH data does not affect the measurement. The AH percentage can be set without affecting the direct relief measurement. Voltage, current, AH, WH, time, power, displayed simultaneously With flexible exit function key, switch on and off. Equipped with 1 voltage, 1 current, 1 temperature and other advanced protection functions    Technical specifications Input voltage: 6V ~ 75V (self-powered measurement) 0 ~ 120V (voltage measurement range when powered externally) Voltage measurement: 0.01 V ~ 120 V. Input current measurement range: 0 ~ 100 A / 0 ~ 200 A / 0 ~ 300 A / 0 ~ 500 A. Electric current: 0.1A ~ 100A / 0.1A ~ 200A / 0.1A ~ 300A / 0.1A ~ 500 A. Capacity measurement range: 0.001 Ah ~ 65000.00 Ah energy measurement range: 0.00KWH ~ 99999.9WH External power supply voltage range: 6-60 V. Display size: 1.8 color LCD display inches