Accessories Caliper insert holder type 10A Caliper insert holder type 11A 2N – 8NAt “hole” 5N FMS caliper with pressure device type A40 plus insert holders (10A) and external thread inserts (21B). Caliper Pressure Device Caliper Accessories Pressure Device A40 Measure Diameters& Lengths ofGrooves& Recesses StandardCaliper Accuracy& Calibration