🔍 Key Concepts

• How to read a vernier micrometer caliper: sleeve (barrel) scale for thousandths, thimble scale for additional thousandths, and vernier scale for ten‑thousandths of an inch • On a typical inch micrometer, each numbered division on the sleeve is 0.100 in, each short tick is 0.025 in, and each line on the thimble is 0.001 in • The vernier scale gives the fourth decimal place by finding which vernier line best lines up with a line on the thimble

💭 Think About

• First, look at figure E and decide: up to what value on the sleeve scale is clearly past the reference line? Is it just under 0.300 in or just over? • Then, find which thimble line is exactly in line with the sleeve’s reference mark to get the thousandths; is this closer to 0.00, 0.01, or 0.02 on the thimble? • Finally, on the vernier (the small numbered 0–10 scale), which line lines up exactly with a thimble division to give the ten‑thousandths digit?

✅ Before You Answer

• Confirm the sleeve reading (all full 0.025" increments passed) before adding thimble or vernier values • Check that you’re using the thimble zero line for the 0.001" reading, not a nearby tick that only looks close • Verify which single vernier line is in perfect alignment; that number becomes the fourth decimal place (0.000x) and should match the last digit of your final choice