Involvement:Expert (understands the inner workings) - Ownership:1 day to 1 week
It's a multi-channel very cheap and tiny voltmeter.
LED display is bright enough, build quality is very good.
It is not precise, with pin 2 open it told me there is a 0.05V
You have to connect pin 3 to + of a battery or a power supply to get device working.
The most important is that no firmware upgrade available. You can't change the speed of indication per channel, you can't add over- and undervoltage detection.
I thought I could use such a device as a combined Volt and Ampere meter for regulated power supply if I put some resistive current sensor to 1st cell voltage input, and put the output voltage to 2nd channel. However I don't need it to add or subtract these values.
It's a great device, however you can't change the firmware yourself.
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