Quick Answer: The Inside Outside Caliper is a polished high-carbon steel transfer caliper, made in inside and outside versions, for taking bore and external sizes and checking them against a steel rule or micrometer.
Last updated: October 2026
Key Features
Inside version for bores and internal diameters; outside version for external sizes
High-carbon polished steel legs
Hardened, precision-ground measuring tips
Firm friction joint or spring-tensioned screw adjustment holds the setting
Available in 150mm, 200mm and 300mm sizes
Technical Specifications
Specification
Value
Type
Indirect measuring caliper (inside and outside variants)
Material
High-carbon polished steel
Joint
Firm joint or spring-tensioned screw
Sizes
150mm (6 inch), 200mm (8 inch), 300mm (12 inch)
Tips
Hardened, precision-ground
Use
Transfer of dimensions to a steel rule or micrometer
About This Product
A transfer caliper is opened or closed until its tips just touch the part, then lifted away and laid against a rule or micrometer to read the size. Workshop and engineering students use it to learn indirect measurement on bores, internal cavities and curved outer surfaces that a straight rule cannot span.
Frequently Asked Questions
What sizes does the Inside Outside Caliper come in?
It is listed in 150mm (6 inch), 200mm (8 inch) and 300mm (12 inch) lengths.
How is the measurement read?
The caliper holds the size at its joint, and the opening is then measured with a steel rule or micrometer.
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