Long Reach Thickness Gage This thickness gage is designed to help you measure thickness applications when you have a lip or ledge that you need to get over, or you need a long reach to measure your parts. Specifications include... 0-8" / 200mm Measuring Range 0.01" / .2mm Resolution 4" Max Contact Travel Each Arm 28.7" Arm Reach 4" Contact Length Upper 4" Contact Length Lower SR20 Upper & Lower Contact Points