10X for Diameter Radius gauge, for 16mm standard caliper

This is designed for big big radius, if you measurement returns 10mm, the diameter will be 100mm, (R=50mm)
the actual accuracy will be affected by printer accuracy, so i recommnd use a rod to conduct calibration before proceed to actual measurement.
For example, you have a rod which can be maasured using your caliper and found to have diameter of 50mm, remeasure using this gauge get the measurement to be 5.3mm, you know your measuremnet will be 0.3mm longer, so you should zero your caliper at 0.3mm to compensate the error.