Feature:1. Pointer type VU meter head, pointer response is sensitive, accurate measurement.2. With highdefinition LED backlight function, it can be used normally at night.3. The internal DC impedance is 65010%, and the insulation resistance is above 50M.4. Using highquality ABS material, safe and durable to use, long service life.5. Embedded installation, simple and convenient, pay attention to positive and negative poles to prevent shortcircuit damage.Specification:Item Type: VU Meter HeadMaterial: ABSInternal DC Impedance: 65010%Insulation Resistance: Above 50MFriction: 1mmPointer Length: 21.51mmPointer Width: 0.451mmDamping Time: 2-3 SecondsMeter Installation Position: VerticalBacklight Board Power Supply: DC 12VTest Environment: Temperature 20, Humidity 70%Calibration Instructions:Calibration Point: DC-285uAReference Point: DC-500uAWiring Instructions: The left side is the negative pole, and the right side is the positive poleSize: Approx. 45mm / 1.8in.Package List:1 x VU MeterNote:1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.