Accuszie - 2'' x 0.0002'' Electronic Magnetic Z Axis Setter Height, 0805-4015 Accuracy 0.0002&#039;&#039; Adjustable Height 2&#039;&#039; Magnetic base 360-degree red lamp lights up when touched Accuracy 0.0002&#034; Adjustable height 2&#034; Magnetic base Introduce the tool to the unit until the light is on, then draw back until light is off Adjust the height if needed with preset two all-in screws on the side of the unit and turn the top grey part of the unit alongside the center threaded body. When presetting diameter, rotate too slowly for higher precision. Do not take caliper for presetting unit, only use gage block and preset gauge. Adjust the height if needed with preset two all-in screws on the side of the unit and turn the top grey part of the unit alongside the center threaded body. When presetting diameter, rotate too slowly for higher precision. Do not take caliper for presetting unit, only use gage block and preset gauge.