1Inside and outside
The outside caliper takes outside diameters and thickness; the inside caliper takes bore diameters and groove widths.
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Transfer big diameters-12%CODEcapitalone12Harfington 20-inch inside and outside caliper set
A 500 mm inside caliper and outside caliper. Both are 410 stainless steel, and a friction joint holds the legs where you set them.
12%$36.35
Price with code · Harfington · as of 2026-10-09Code capitalone12 · 12% off
2Friction joint
The legs stay put, so you hold one leg at the end of a rule and read the size at the other.
3410 stainless
Fully heat-treated for hardness and corrosion resistance, with a smooth, burr-free finish.
Key specs
- Length
- 500 mm (20")
- Set
- 1 inside, 1 outside caliper
- Material
- 410 stainless steel, heat-treated
- Joint
- Friction
Good pick if
- You measure large pipes or cylinders
- You are used to transferring sizes to a rule
Think twice if
- You want a digital caliper with a readout
FAQ
Is there a promo code?
Yes. Enter capitalone12 at Harfington checkout when buying the Harfington 20-inch inside and outside caliper set for 12% off.
Does it have a scale?
No. You set the legs, then read the size against a rule.
Can I return it?
The product page offers 30-day returns from delivery. Returns are free within the US; elsewhere you pay the return shipping.
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