Measuring and Layout — FAQ
What's the difference between resolution and accuracy?
Resolution is the smallest displayed increment (0.01mm). Accuracy is how close the reading is to the true value (±0.02mm). A caliper can show tiny changes but still be wrong. Always verify with gauge blocks.
How often should I calibrate my workshop caliper?
Monthly for daily professional use. Quarterly for occasional DIY use. Always verify zero before each use. Drop it? Recalibrate immediately. Use certified gauge blocks, not random objects.
Digital or manual for a beginner?
Digital is easier to read and eliminates parallax errors. Start digital, but learn to read a manual caliper as backup. Manual calipers never need batteries and teach fundamental measurement principles.
Can I use a 6-inch caliper for automotive work?
For most bolts and brake parts, yes. For brake rotors, get 8-inch minimum. For exhaust pipes, you need 12-inch. Consider your primary use case—most workshops benefit from both 6-inch and 12-inch models.
What does IP54 rating actually mean?
IP54 = dust protected (not dust tight) and splash resistant from any direction. It survives coolant spray and grinding dust but not submersion. For heavy machining, IP67 is better but rare in calipers.
Why is Mitutoyo worth the premium?
Mitutoyo uses higher-grade steel with better thermal stability. Their manufacturing tolerances are tighter, and the vernier scale is etched, not printed. It holds accuracy longer and withstands abuse that destroys budget calipers.
