4pcs Digital Mini Digital Voltmeter 0.28Inch Three-Line 0-100V Digital Voltmeter Gauge Tester LED Display Panel Voltmete

Specifications Measuring range three wire DC 0 100VWorking voltage 4 40V with reverse connection protection higher than 40V may be damagedTest accuracy ±1 10V error positive and negative 0 2V 10V positive and negative 0 03VInput impedance 50KΩWorking current 30mARefresh rate about 100mS onceDisplay specifications three wire 0 28 LED digital tubeLead length default 15cmShape ruler 33 x 11 5 x 9 mmMounting hole 23 10 mmOpening size hole distance 26mm hole diameter 2 2mmWorking temperature 10 65 °CWorking humidity 10 80 Working pressure 80 106kPaLED Color Red Blue GreenFeatures 2 Connection Methods 3 wires are connected separately to measure voltage and power yellow red is both forpos black isneg 3 wires are used as 2 wires connected to measure voltage and Yellow can be pair forpos black isneg Mini Voltmeters Total 4PCS 4 colors optional each one 0 28 inch LED Panel small in size and light in weight Features Reverse polarity protection voltmeter will not burn out if reverse polarity is applied high precision low starting working voltage fine adjustment function Good quality This product is made of high quality materials exquisite workmanship very good quality and long service life Package include 4x 0 28inch Digital Mini Digital Voltmeters