  If you are using this meter for the first time, please install the ch341ser.exe driver before connecting it to the computer.After the program is installed, connect to the computer with a USB cable. At this time, the computer will automatically install the interface driver, and the COM number of the interface can be viewed in the device manager - port, such as usb-serial CH340(COM16).
Install the Open computer software, to choose the right COM number in the options page-connect port, click the connect botton, and then go back to the home page, the software can be used normally.