That screw you're replacing — is it 4 mm or 5? The hardware run fails on exactly this. A digital caliper ends the squinting: close the jaws on a bolt, slide the prongs into a pipe, drop the depth rod into a hole, and the screen gives you the number. Switch between mm and inches with a button, zero it anywhere, and write the size down before you drive to the shop — not after you've come back with the wrong part twice.
— The Ghalyh team · How we pick
Good for
Matching screws and wall plugs · sizing pipes and fittings · checking a part before ordering online
Not for
Machine-shop precision work — there, a micrometer plays in another league. This is household and repair accuracy, not engineering tolerances.
Specifications
- Measures
- Outside, inside, depth, step
- Units
- mm and inches, one-button switch
- Display
- Digital, with zero-anywhere button
Questions people ask
Why not just use a tape measure?
A tape reads to the millimetre if you squint. A caliper grips the part and reads finer than that — the difference between a wall plug that holds and one that spins.