I don't know anything about your laser measuring device. But usually, for bluetooth devices, the first time you try to connect with the computer through the USB adapter, you need to "pair" them by inputting any combination of numbers (both on the computer, and on the external device). The set of numbers can be anything you want. It's just to make sure that you're connecting the right bluetooth device. If there's a keypad on the laser device, just enter any PIN, and do the same on the computer when prompted.