DFRobot DFR0130-B Panel Meter, 4.5V-30V LED Voltage, 3-Digit, 1% Accuracy, 1.88" W x 1.14" H, Blue Low Battery Display

Low Battery Display

Includes Both a Photo and Contact Tachometer in One Precision Instrument

they are: inductance L

USB (Virtual COM) interface

Power Supply: 9V battery or 12V adapter

DFRobot DFR0130-B Panel Meter, 4.5V-30V LED Voltage, 3-Digit, 1% Accuracy, 1.88" W x 1.14" H, Blue Low Battery DisplayMeasure voltage: 4. 5 30V dc Refresh rate: 2 hz Accuracy: 1 percent Dimensions: 1. 88"W x 1. 14"H (face), 1. 80"W x 1. 02"H (rear) This is a standalone DC voltage meter. It measures 4. 5V 30v with 1 percent accuracy, best suitable for battery level display. Just apply two wires on the power without any extra circuit or components; it gives the reading straight away. Easy to use, and good company with robot application.