Technical Data:
Series: 368
Product type: Holtest Bore Micrometer
Measurement: Inside diameter
Two-point contact type: Small-hole models
Three-point contact type: Self-centering for stable measurement
Feature: Measures close to bottom of a blind hole
Three-point models over 6 mm / 0.28 in use titanium-coated measuring pins
Three-point models can measure deep holes with optional extension rod
Contact type: Three-point
Measuring range: 20 - 25 mm
Graduation: 0.005 mm
Accuracy: +/-3 um
Optional extension rod: 952622 (150 mm)

Dimensions:
Maximum measuring depth L2=94 mm
Overall/reference length L1=137 - 142 mm
Blind-hole reference L3=0.3 or below mm
Blind-hole reference L4=8.3 mm
Blind-hole reference L5=5.2 mm
External appearance varies by measuring range