Hole-Chek© 

Instant diameter of small holes, available in Analogue or Digi-Chek© digital gauges. Digi-Chek© features instant measurement, SPC output, easy to read LCD screen, inch/metric on-the-fly conversion, capable of 178 readings per second, feature lock and three different hold options. .001" (0.02mm) diameter increments. Suitable for screw machine parts, spray tips, injector nozzles, plastic moulded parts, as well as a variety of other applications. 
Also Available : Super Hole-Chek© with up to 10x greater resolution

Chamfer-Chek©

Simply select I.D. to measure the top or O.D. to measure the minor diameter of tapered holes, chamfers, or conical parts. Available in Analogue or Digi-Chek© digital gauges. Digi-Chek© features instant measurement, SPC output, easy to read LCD screen, inch/metric on-the-fly conversion, capable of 178 readings per second, feature lock and three different hold options. Available in 0-90º and 90-127º models. Suitable for steel valve inserts, machine tools, circuit boards, sheet metal and stampings.