# Zero Adjustment LED Indicators

The MTRwrench 85 LED Indicators show the operator when a zero adjustment is required and communicate the progress, completion and possible errors of the zeroing process:

LED indicators | Meaning | Remark
--- | --- | ---
Progress LEDs all blinking white |  | Zero adjustment required. | Place the wrench into the cradle.
Progress LEDs turn on and off in sequence back and forth. |  | Zero adjustment ongoing. Firmware update in progress | Do not move the wrench. Do not apply any load to the wrench.
Progress LEDs off. |  | Zero adjustment completed successfully. | -
Progress LEDs blinking white + Error/Warning LED blinking red | + | Zero adjustment failed due to wrench moving or to load being applied to the transducer. | Remove the wrench and place it again into the cradle to start a new zero adjustment.
Progress LEDs steady red + Error/Warning LED blinking red | + | Zero adjustment failed due to wrench moving or to load being applied to the transducer for a second time during the zero adjustment. | Remove the wrench and place it again into the cradle to start a new zero adjustment.

Relevant Information

- Performing a Zero Adjustment