["USB Voltage Meter OTG Interface Android Phone USB Tester Voltmeter -40~ 40V for DC Data Save File Function Voltmeter\r\nAndroid Phone USB Voltage Tester Meter OTG Interface Voltmeter -40~ 40V for DC Data Save File Function Voltmeter\r\n\r\nDescription:\r\n brand new,high quality\r\n\r\nFeatures:\r\nThis is a for DC voltage meter\r\nIt is an Android mobile phone voltage meter which based on the USB OTG interface, through the matching adapter it can also be connected to the computer USB port.\r\nVoltOTG probe to the USB is not any isolated, so it is not recommended to measure high voltage.\r\nThe matching Android mobile phone software can see the measured signal waveform,with data saved and other functions\r\nPortable and easy to carry\r\n\r\nSpecification:\r\nMaterial: Plastic\r\nSize: Approx. 20x17x2cm / 7.87x6.69x0.79inch\r\nMearsurement Range: -40~ +40V\r\nAD Coversion Rate: 15~240SPS\r\nUSB Communication: 115200BPS\r\nAccuracy: 1%\r\n\r\nNote:\r\nAndroid mobile phone must support the OTG function then it can be used\r\n\r\n \r\nPackage Includes:\r\n1 x Voltmeter\r\n4 x Probe\r\n2 x USB Conversion Adapter (MicroUSB to A-USB, MicroUSB to Type-C)\r\n1 x Instruction Manual"]