Fangrui Product Details 1. It Has High Precision Lm3914 Analog Voltage Detection, Users Can Accurately Know The Remaining Battery Power. 2. The Power Display Range Is Adjustable, And The Display Range Can Be Adjusted According To The Battery Power. 3. Led Power Indicator Light, Clear At A Glance. 4. Suitable For Lithium Batteries, Lead-acid Batteries And Other Batteries, Widely Used. 5. The Power Display Tester Is Simple To Test And Easy To Use. Parameter: Power Consumption: Bar Display Full Brightness 42ma, Single Lamp Display 4ma Measuring Range: Battery In General 2.4-20v Display Mode: Multi-light Bar Display Or Single Lamp Dot Display Size: 50x25mm Tips For Use(one Side Of Nixie Tube With Words Is A Positive Plate): 1. Adjustment Sequence Is To Adjust The High-end Voltage First And Then Adjust The Low-end Voltage. Repeat Several Times For Accurate Display. 2. Lower Voltage Display Adjustment: When Connecting To The Lower Limit Voltage, Turn Counterclockwise If Not Lit, And Clockwise If Lit Several Or All Lit. Adjust It To