GRABO® Pro-Lifter 20 learning mode / recalibration mode :
Place the GRABO Pro-Lifter 20 on a non-porous surface such as a polished tile.
Slide the power ON/OFF switch in the ON position.
*The device is now calibrated and the values in the digital display window should be correct.
Important : The GRABO Pro-Lifter 20 will display incorrect values on the digital display if the device is not calibrated on a non-porous surface such as tile or glass. If this occurs, the calibration process must be repeated on a non-porous material. DO NOT perform this process on glass that is thinner than 6mm. Damage can occur to glass that is thinner than 6mm.