USB Voltage Meter OTG Interface Android Phone USB Tester Voltmeter-40 - 40V DC Data Record Function Voltmeter Android Phone USB Voltage Tester Meter OTG Interface Voltmeter-40 - 40V DC Data Recording Function Voltmeter Description: 100% Brand New High Quality Features: This is a DC Voltmeter is an android mobile phone voltage meter, which based on USB OTG interface, through the matching adapter, it can also be connected to the USB port of the computer. The VoltOTG to USB probe is not isolated, so high voltage measurement is not recommended. The matched android mobile phone can see the measured signal waveform, with stored data and other functions portable and easy to carry Specification: Material: Plastic Size: Approx. 20x17x2cm/7.87x6.69x0.79 inch Measurement Range: -40 - +40V AD Conversion: 15 - 240SPS USB Communication: 115200BPS, you can mention them: 1% note: the android mobile phone must support with OTG function, then it can be used software download Link: