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SKU:U087 with Raspberry Pi 4

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Hello,
I wish to buy "Voltmeter Unit" SKU:U087 to use on Raspberry Pi 4 I2C bus.
I don't understand the features about 5VDC and 3.3VDC.
- Can you confirm the diagram on how to connect the grove cable on GPIO Pins ? Do you agree with my picture ?
- can I measure tension of two 12VDC battery in serial (~24 VDC) ?
Best regards.
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