Specifications: EBD-A20H 30V-20A-200W Power supply method: DC 12V 1A Voltage setting: 0.00-30.00V, minimum step 0.01V   Current setting: 0.10-20.00A, with a minimum step of 0.01A (automatically limiting the current when the power exceeds the limit) Mode setting: DSC-CC (Constant Current Discharge): The discharge current is constant, used to test battery capacity or power supply current DSC-CP (constant power): discharge power is constant, used to simulate constant power equipment or test power supply power Voltage measurement: 0.000-4.500V (low voltage range), accurate to 0.003V, error ± 0.5% 4.50V-30.00V (high voltage range), accurate to 0.01V, error ± 0.5% Current measurement: 0.10-20.00A, accurate to 0.01A, with an error of 0.5% Within 10Ah, with a resolution of 0.001Ah Capacity measurement: 10Ah-100Ah, resolution 0.01Ah Above 100Ah, with a resolution of 0.1Ah Discharge power: maximum 200W, controlled within 90% during long-term operation Wiring method: Four wire detection, voltage measurement and current channel separate wiring to ensure measurement accuracy LCD display: voltage, current, capacity, time, power, energy and other test data Computer online: Dedicated USB to T serial cable (aviation plug interface, not regular USB cable) Computer control, curve drawing, automatic current testing, calibration of measurement standards, and upgrading of equipment components Package Included: 1 x EBD-A20H battery tester 2 x Cables 1 x USB to TTL cable 1 x Power Supply Adapter