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This 0.28-inch three-wire DC voltmeter is a compact module for reading voltage on a project panel, battery pack or power supply, using a bright red LED display. It measures a range of 0 to 100V, which covers most low-voltage DC systems a hobbyist is likely to build, from small battery-powered projects up to higher-voltage supplies used in some power electronics work.
Being a three-wire design, the module's own display power supply is kept separate from the voltage line being measured, which generally gives steadier, more accurate readings than a simpler two-wire arrangement that shares the same connection for both jobs.
Wiring is minimal: connect the appropriate wires and the display starts reading voltage. Reverse polarity protection guards against a wiring mistake during installation, and the display automatically adjusts its decimal point based on the voltage range being read, so no manual configuration is needed to get a sensible-looking number. Accuracy is rated at 0.1V, and the display turns on once input reaches 3V, requiring a minimum input of 3V and rated up to a highest input of 30V for the display circuit itself even though the measurement range extends to 100V.
Current consumption is 10mA, and the display refreshes every 200ms. It operates from -10C to 60C, and the whole module weighs about 3g, measuring roughly 0.72cm high, 1.3cm long and 3cm wide, with 0.3cm mounting holes.
Anyone building a battery monitor, a bench power supply readout or a simple panel meter for a DIY project will find this small module an easy way to add a voltage readout, without needing a full multimeter permanently wired in.
0 to 100V.
It separates the display's own power supply from the voltage being measured, for steadier readings.
Yes, it has reverse polarity protection.
Rated at 0.1V accuracy.
0.28 inches (0.72cm), with a small overall module size of about 1.3cm x 3cm.
| Brand | Generic |
|---|---|
| Accuracy | 0.1V |
| Selling unit | PCS |
