What is the instrument used to measure the internal and external diameter of a tube of about 5cm bore? - Quora
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1 lab measuring tool, 250ml plastic measuring cylinder, strip scale tube, chemical lab equipment | Fruugo UK
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SHAHE Tube Thickness Caliper With Large LCD Screen Inch And Millimeter Conversion Measuring Tool Electronic Vernier Caliper - AliExpress
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Mills Tube Measuring Gauge -Mills Ltd - London's Leading Supplier Of Structured Cabling & Specialist Tooling -
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