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Need to keep an eye on your battery voltage so you don't get stranded?
This MECCANIXITY voltmeter pack gives you three little displays—one red, one green, one blue—so you can monitor multiple batteries or just have spares handy.




Each one runs on the voltage it's measuring (supply range varies by color—red needs 4.
5V, green 4.
7V, blue 5.
0V, all up to 30V).
They draw very little current, like under 23mA, so they won't drain your battery.
The 0.
36-inch LED tubes are bright and easy to read, even in daylight.
Refresh rate is about 300ms, so numbers update fast enough.
Hook 'em up with the three wires, mount 'em wherever fits, and you're good.

4.5 out of 5