This is a standalone DC voltage meter. It measures 3V-30V with 1% accuracy. Best suited 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 is a good company with robotic applications. Three colors options: green / blue / red. Specification * Measure Voltage:3.0-30V DC * Refresh Rate:2 Hz * Accuracy:1% Shipping List * LED Voltage Meter (Green) x1 https://elecena.pl/product/22714043/led-voltage-meter-red-discontinued 2023-03-06 https://elecena.pl/product/22714043/led-voltage-meter-red-discontinued 2024-09-19