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: 3.5 - 4 in
Graduation: 0.0002 in
Accuracy: +/-0.0002 in
Optional extension rod: 952623 (150 mm)

Dimensions:
Maximum measuring depth L2=105 mm
Overall/reference length L1=150 - 163 mm
Blind-hole reference L3=0.3 or below mm
Blind-hole reference L4=17.0 mm
Blind-hole reference L5=14.0 mm
External appearance varies by measuring range