Please complete the following registration form to officially register your Testo Digital Manifold (549, 550 Bluetooth, or 557 Bluetooth) so you can stay up-to-date on product announcements and software updates. You will also receive an upgrade to 5 years for your manufacturer's warranty. **NOTE** The serial number is located behind the battery door, on the silver tag. The Serial Number is located above the barcode, and the Date of Manufacture is the circled 4 digit number (MMYY) to the right of the Serial Number. When selecting the Date in the form below, please choose ANY date within the Month and Year of the Date of Manufacture for your Manifold.