Technical Data:
Product type: Tubular Inside Micrometer, Extension-Rod Type
Measurement: Inside dimension
Reference setting: Reference gage required
Optional reference-setting methods: Gage Block Accessory Set, CERA Inside Micro Checker, or setting ring up to nominal 12 in
Family construction: Micrometer head combined with extension rods and anvils

Technical Data:
Accuracy formula, inch models: +/-{0.00015 + 0.00005n + 0.00005L/2} in
L=Maximum measuring length in inches
n=Number of rods
Fraction rounded up

Technical Data:
Accuracy formula, metric models: +/-(3+n+L/50) um
L=Maximum measuring length in mm
n=Number of rods
Fraction rounded up
Quantizing error excluded

Technical Data:
Series: 137
Display: Analog
Graduation: 0.001 in for inch models / 0.01 mm for metric models
Two measuring-face types are available: standard and carbide-tipped
Micrometer-head stroke: 0.5 in / 13 mm
Main-unit range: 2 - 2.5 in / 50 - 63 mm
Measuring range: 50 - 500 mm
Measuring face: Standard
Extension rod quantity: 6

Content:
Extension rods:
13 mm
25 mm
50 mm (2 pcs.)
100 mm
200 mm

Dimensions:
Micrometer main-unit common geometry:
Main-unit body length=50 mm
Front/rear measuring-point Dia.=4 mm
Body Dia.=15 mm
Rear/reference Dia.=5 mm
Reference dimensions=1.7 mm, 23 mm and 4.8 mm
Measuring faces=SR10
Extension-pipe thread=M10x1
Cover provided