ZIP-50 How to use Z AXIAL preset gauge: 1. Under probe face was seting micro-adjust, please use parallel block for adjust height. 2. High precision products, not suit for vernier scale to test precision. 3. When the light is on due to fast feed cutter, please draw back slightly till the light put out, and then go forward slowly till the light is on, for indeed control precision. 4. Inside probe, please use the cutter's higest point to touch probe face.