Brand Jtron Model 03100383 Quantity 1 Color Black Material Plastic Specification Weight: 10g; Display color: Red; Display mode: 0.28" LED 3-digital tube; Update rate: About 1s/time; Physical size: 27 x 15 x 18mm (L x W x H not including installation ear); Opening size: 27 x 15mm (Lx W); Power supply: Don't need the power supply direct use of the test voltage as a power supply; Lead wire length: 8.5cm; The minimum input: 3.50V; The maximum input: 30.0V; Measurement range: DC 3.50~30.0V; Operation temperature: -10'C~+65'C; Measurement accuracy: +/- (1% + 1 Digit); Red line: Power Supply + Measure Voltage + (DC 3.50~30.0V); Black line: Power Supply - Measure Voltage- Features Starting voltage is low only 3.50V can correct measurement variable precision: Precision automatic change below 10.0V the highest resolution of 0.01V Precision automatic 10.0V above changes the highest resolution of 0.1V Application Potting voltmeter head has: waterproof dustproof shockproof; Real is three USES the high quality transparent epoxy glue potting. Can be widely used in automobiles motorcycles etc. easy to deal with the bad environment English Manual/Spec YES Other Connection is simple just need to pick up two lines a joint reverse protection then do not burn; Starting voltage is low only 3.50V can correct measurement Variable precision: Precision automatic change below 10.0V the highest resolution of 0.01V Precision automatic 10.0V above changes the highest resolution of 0.1V; Can be used for measuring the car / battery car / motorcycle battery voltage and other forms of voltage; Can be used in all kinds of voltage measurement purposes; Potting voltmeter head has waterproof dustproof shockproof; Real is three USES the high quality transparent epoxy glue potting. Can be widely used in automobiles motorcycles etc. easy to deal with the bad environment. Packing List 1 x Digital voltmeter (10cm-cable)