Specification: Display: Power, Voltage, Close, the for key for cycle. Voltage Range: 6-63V, products will display based on the voltage value , voltage fluctuations, power meter will be follow as the voltage fluctuation! (Comes with reverse polarity for protection, can be guarantee use effectively ) The product is suitable for lead-acid 12V, 24V, 36V, 48V (can be changes via for key, specific please see setup instructions as below) The product is suitable for 3.7V lithium series multi-platform, 3 string, 4 string, 5 string, 6 string, 7 string and 8 string 9 string 10 string 11 string 12 string 13 string 14 string 15 string (can be changes via for key, detail information please see as below) Cable Length: 30cm Backlight: White Color Dimension: 61.3mmx33.3mmx13.5mm / 2.41''x1.31''x0.53'' Hole Size: 58.5mmx28.5mm / 2.30"x1.12" Instructions: 1. Press and hold switch on the product, power on, automatically select the interface ( please follow as the code corresponds blow) 2. Select your battery type after corresponding, for example 3 series lithium battery, you need to enter the selection screen, press the for key point to for L3 interface, then off, re-energized, choose success, such as the need to set 12V lead-acid batteries, the for key point press to P12V interface, power, re-energized, both choose success 3. instruments can be used if you Select successful. Meter shows the power interface, tap switch, switch to voltage interface, click the switch, turn off the meter. cycle shown as the code corresponds Fitment: Code: Suitable for For L3: 3 string lithium L4: 4 string lithium L5: 5 string lithium L6: 6 string lithium L7: 7 string lithium L8: 8 string lithium L9: 9 string lithium L10: 10 string lithium L11: 11 string lithium L12: 12 string lithium L13: 13 string lithium L14: 14 string lithium P12V: 12V lead-acid P24V: 24V lead-acid P36V: 36V lead-acid P48V: 48V lead-acid Note: Special Function Setting (requires electric iron, you must power off setting, electric iron must be grounded) A point connection, the backlight will be automatically shut down if delay10 seconds , the voltage fluctuation will automatic wake-up exceeds 0.3V / 0.5 seconds. B point connection, lithium choose 3-4.1V curve (lithium professionals) Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Package Included: 1 X Battery Capacity&Volt Tester 1 X Cable