I concur with the "battery" issue! It seems that every time I get the digital caliper out, the GD display is flashing. I keep a few packs of 357 batteries in the drawer. I use the digital caliper when measuring something set up on a machine and cannot read the manual dial with my shitty eyes. What bore gauge do you have? I use a Sunnen gauge with a setting fixture and confirm with a mic that measures the desired bore or piston size, then using a shop towel in a vise, lightly clamp it in on the back of the mic to hold it. I then after the correct gauge point is selected, fine adjust the gauge dial ring to set the desired measurement. Eazy-Peezy, only done it bout 100000 times...