Description: Suitable for Battery Pack Based on Lead-Acid Battery.The Screen Can Display Voltage, Energy, Percentage of Electricity at the Same Time. Oltage Range of 6- 120v. (Lead-Acid Battery 12V for this item) easy to connect with only two wires.Setting mode: 1. Power on (Red for + and Black for -) 2. Press A Few Seconds to Setting Mode: From 1-U, 2-B, 3-C To 4-D.A) 1-U ： Voltagecalibrationb) D ： Setting "ShowingMode" 3. 1-U ： Voltagecalibration: While on 1-U, Press the Button to Enter Into VoltagecalibrationMode, Release It and Press Again, Voltage Will Be Step-Up Adjusted; release the button and then press it to step-down adjust; Repeat adjust and save the setting while the screen flash and exist setting.4. 2-B ： Adjust Battery Type: While on 2-B, Press the Button to Change the Type of Battery Press One by One Will Showed: 1.2V__2V__3.2V__3.7V__12V (While Adjust To Approach Battery Type Exist Setting When the Screen Flashing.) A) 1.2V ： Ni-MH Battery, Each Battery 1.2VB) ： Polymerlithiumbatery, Each Battery 3.7ve) 12 V ： Lead-Acid Battery, Each Battery 12V5. 3-C ： Setting Number of Batteries: a) While on the "3-C" Setting, Press the Button To Enter Into Setting Number of Batteries.B) Release the Button and Press Again, Value Will Be Step-Up Adjusted; Release the Button and then Pressit to Step-Down Adjust; Repeat adjust to appropriate number of batteries.c) Save the setting while the screen flash and exist setting.D III. 3.2V Lithium ion Battery: 2-32 Sections2V Lead-Acid Battery: 3-60 Sections1.2V Ni-MH Battery: 10-70 Sections4-D ： Setting Showing Modea) While on "4-D", Press the Button to Enterer Into setting Showing mode.B) Release the Button, Press It Once Showed One Mode: V Isvoltage, % Isspercentage of Power (These Twowill Be in Cyclic Display) C) Adjust to Apprake Mode, Save the Setting Where The Screen Setting .Samples for setting ： Lead-Acid Battery2-Bbattery Type3-Cnumber of Batterypolymer Lithium Battery2-Bbattery Type3-Cnumber of Battery12V12V112V3.7V324V12V218V3.7V536V12V324V3. 7V648V12V436V3.7V1056V2V2848V3.7V1360V12V560V3.7V1664V2V3272V12V684V12V7Technical Parameters ： Voltage Measuring Range: DC6 ~ 120V (Wide Range) , The maximum input voltage may not excheed 120vtest voltage: DC6 ~ 120V (Decimal Point Automatic Shift) The Minimum Resolution Below 100v: 0.1vthe Minimum Resolution of 100V: 1Venergy Resolution: 1%Working Current: & Lt; 20mascreen Display: Ledexterior Dimension: L48 X W29 X H21MMOPENING HOLE FOR INSTALLING: 45.5 x 26.5mmmeasurement rate: More than 500ms/ TimesVoltage Measurement Accuracy: 1% (+/ ; 150mmminimum Supply Voltage: +6VMAXIMUM POWER Supply Voltage: +120Voperating Temperature: -10 c ~ +65 corking humidity: 10 ~ 80% (no condensation)