Specification: Display: Power, Voltage, Closure, Cycle Key. Voltage range: 6-63V, products will be displayed based on the voltage value, voltage fluctuation, the power meter will follow as the voltage fluctuation! (Comes with reverse polarity protection, can guarantee effective use) the product is suitable for lead acid 12V, 24V, 36V, 48V (can be changed by key, detailed see setup instructions as below) the product is suitable for multiple platforms 3.7V lithium, 3 strings, 4 strings, 5 strings, 6 string, 7 string and 8 string 9 string 10 string 11 string 12 string 13 string 14 string 15 string (can be changed by key, Detailed information see below) Cable Length: 30cm Backlight: White Color Dimension: 61.3mm x 33.3mm x 13.5mm/2.41'' x 1.31'' x 0.53'' Hole Size: Instructions 58.5mm x 28.5mm/2.30" x 1.12": 1. Press and hold the switch on the product, turn on the power, automatically select the interface (follow the code corresponding to blow) 2. Select the battery type after the corresponding one, for example, series 3 lithium battery, you need to enter the selection screen, press the key to the L3 interface, then turn off, Re-energized, select the success, such as the need to set 12V batteries, the key point press to P12V interface, power, re-energized, either select success 3. Instruments can be used if you choose success. The meter shows the power interface, valve, switch to voltage interface, click the switch, turn off the meter. The cycle is shown as per the code best shipping terms and best price assembly: code: suitable for L3: 3 lithium string L4: 4 lithium string L5: 5 lithium string L6: 6 lithium string L7: 7 lithium string L8: 8 lithium string L9: 9 lithium string L10: 10 lithium string L11: 11 lithium string L12: 12 lithium string L13: 13 string lithium L14: 14 string lithium P12V: 12V lead-acid P24V: 24V acid P36V: 36V acid P48V: 48V lead-acid note: special function setting (requires electric iron, need to turn off the setting, the electric iron must be grounded) point connection, The backlight will be automatically turned off, if the delay occurs 10 seconds, the voltage fluctuation will automatically exceed 0.3V/0.5 seconds. B connection point, lithium select 3-4.1V curve (lithium specialists) item color displayed in photos may be showing slightly different showing on computer monitor since monitors are not calibrated same. Package Included: 1 X Battery Capacity & Voltage Tester 1 X Cable