NOYITO 0.28 inches LED Ultra-Small DC Digital 0-100V Voltmeter 3-Wire Battery Voltage Tester Red Blue Yellow Green Four Colors Display 4.0-40 Volt Power Supply (Pack of 3)(Green)
Parameters: Used as a 2-wire voltmeter, working voltage: 4.0~40V (with reverse
connection protection) Used as a 2-wire voltmeter, measuring voltage: 0.0~40V.
3-wire working voltage: 4.0~40V (with reverse connection protection). 3-wire
measuring voltage: 0.0~100V. Measurement accuracy:1 %(+/- 1 digit) Refresh
Rate：about 200mS/times Operating Temperature:-10 °c ~ +65 °c Power
consumption: 5-15mA in normal condition Display:Three 0.28 " LED digital
display Display Color:Green/Red/Blue/Yellow Cutting size:23.5mm x 10mm
Mounting holes distance:28mm Wiring: The second and third pictures are the
wiring diagrams. Red: Power Supply +,(4.0~ 40V DC) Yellow: Measure Voltage
+,(0~ 100V DC) Black: Power Supply -, Measure Voltage - Note: 1.The meter
requires extra power supply of DC 4.0 to 40V 2.Its resolution is 0.1V and its
actual error might larger than 0.1V Package Included: 3pcs NOYITO 0.28" LED
Ultra-small DC Digital 0-100V Voltmeter
 
Product Features
  

         
Small in size and light in weight,quite easy and convenient to carry out. There are four colors of red, blue, yellow and green.
         
0.28" visible LED display, easy to read even in dim light
         
It requires extra power supply of 4V to 40V; only has three-wires for simple connection.It can also be used as a two-wire voltmeter. For the wiring diagram, please refer to the third wiring diagram on the left. Please pay attention to the parameters of the two-wire voltmeter.
         
With reversed connection protection, meaning it will not burn even when wires are connected reversely
         
Has resolution of 0.1V and the potentiometer in the back side for accuracy adjustment The second and third pictures on the left are the wiring diagrams.