6PCS Digital Voltmeter Ammeter,DC 4.5-30V Voltage Meter Tester Two-Wire Red LED Voltmeter Waterproof Display Voltage Tester for Solar Battery Monitor Car (DC 0-100V Red Blue)
Measure voltage: DC 3-30V (2 wires Access). Input Polarity: DC voltage
Display: 0.56" digital LED Tube，Display Color: Red Dimensions: 48mm x 29mm x
22mm Refresh rate: about 300mS / times Operating temperature: -10°c to 65°c
Wire length: 20cm Method of wiring Red wire: Positive Black wire: Negative
Measurement accuracy (allowable tolerance: 1% +/- 1) Less than 10V, accurate
to 0.01V; More than 10V, accurate to 0.1V; NOTICE If the input voltage is
higher than DC 30V, the voltmeter will be burnt. Please don't use this meter
in 24V battery since when the battery is full-charged, its voltage will be
about 30V.
 
Product Features
  

         
Power supply range: DC 3.5-30V, no additional power supply, directly use the test voltage as a power supply. Input voltage higher than 30V may cause damage to the product.
         
Working current: red <23mA, green <18mA, blue <12mA;Refresh rate: 300ms at a time.
         
Simple Wiring: red positive, black negative.Lead length:20cm(7.87'').
         
Reverse Protection:If it is reversed, it will not be burned.
         
High precision:The decimal point moves automatically and is equipped with a miniature potentiometer for fine adjustment