SummaryStop Playing the Guessing game with is my bed level. Easily clamps onto the Back of the Carriage Assembly to measure Depth. 1" SAE/Metric Digital Indicator From Harbor Freight http://www.harborfreight.com/1-inch-sae-metric-digital-indicator-93295.html InstructionsParts need- Dial Leveling Clamp (RP) 1- M4 X 50mm Screw (Can be longer) 1- M4 X 10mm Screw (Can Be longer) 4- M4 Washers 1- M4 Locking nut 1- M4 Wing nut 1- 1" SAE/Metric Digital Indicator From Harbor Freight http://www.harborfreight.com/1-inch-sae-metric-digital-indicator-93295.html Optional items Replace 2 of the M4 Washers with Fender washer to distribute the load better Operation: Center Dial in the middle of the bed Zero Gauge Drive the Carriage Left 50mm then right 50mm(With you host software) Adjust the Left or right screws accordingly Measure Again Center Dial in the middle of the bed Zero Gauge Drive the Carriage forwards 50mm then Backwards50mm With you host software Adjust the front or back screws accordingly Measure again Repeat all the steps untill you are happy with you results Adjust Z endstop to big the nozzle lower or higher I was able to archive +- .1mm around my whole bed. Helps out tremendously with larger prints.