Digital Panel Mount Volt Meter DC 4.50 - 30.0V for Arduino Display

Description : 

1. The wire connection is simple only need two wires, the red line connect the anode, the black line connect the cathode. Within the voltmeter there are reverse polarity connecting protection. 
2. This voltmeter working without external power supply, can measure the voltage directly, wide working voltage of 4.5-30 V 
3. For best accuracy of measurement, depending on the voltage measured, the voltmeter automatically move the position of the comma. when voltage below 10 V, it shows two decimals; when voltage is over 10 V, it shows a decimal. 
4. The voltmeter can be used in motorcycles, cars etc, monitoring battery voltage, grasping the battery condition timely. Can also for other purposes voltage 

Specifications : 

• Shape size: 48X29X16mm 
• Measuring range: 4.5-30V 
• Hole: 46X27mm 
• The minimum input: DC4.5V (then the minimum voltage, measurement inaccuracies or display) 
• Wire length: 20 cm 
• the maximum input: DC30V (Higher than this voltage, in danger of burning out) 
• Display method: three-digit number 0.56in LED Nixie tube 
• Display color (optional) : Red / Green / Blue 
• Update rate: about 200ms / time 
• Power supply: No need 
• Power consumption: Less than 20mA, normally 5 -15mA 
• Working temperature: -10 ~ 65 ℃

Note :
30V is this voltmeter maximum limit voltage, please keep enough allowance for table, to avoid permanent damage to the voltmeter due to spark of motor, 
power ripple and other mutations voltage

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