DC 0-120V 0-100A Volt Amp Ah Power Capacity Percent Battery Monitor Watt Meter This Battery Monitor is designed to monitor performance most kind of battery systems with capacities of up to 999 Amp hours. The unit continuously monitors voltage, charge and discharge current, number of power (charge or discharge), the remaining battery capacity, these information leads to more efficient use of the battery, which can enhance battery life and reduce the risk of failure. Battery Status At A Glance. Measure Forward (Positive) and Reverse (Negative) current at the same time. Combines many functions in one, displays voltage, charge and discharge current, consumed amp hours and remaining battery capacity. Dual display for Voltage (V) Current (A), Power (W) Ampere-hour (Ah), Working Hours (H), Charging Time, Discharging Time Battery capacity (%) Flexible On-line calibration function, calibrate Voltage and amps reading easily. Adopting modular design, collocate indicator lights on the panel for various working status. 4 digits LED for Voltage, Power, and Working hours reading, 3 digits LED for Current and Ah reading. Lowe power consumption. No need external power (10-90V). We can connect it by 2-wire(Power by Internal source), or 3-wire(Power by External source). We also can provide other Current Version, such as 30A/100A/200A/300A/500A, please contact us for any help!