micro:bit STEM Core Kit
Digital Voltage Meter 
The Digital Voltage Meter (DVM) measures the voltage available between its two snap connections. The available voltage needs to be more than 2.5V as that is what also powers the DVM.
snap connections so can be left in the circuit
reverse polarity protection (if connected backwards)
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is a registered trademark of Coplin Corp Pty Ltd, Australia.
As part of continuous product development and improvement, specifications are subject to change.