🔍 Key Concepts

• Purpose of a ratchet stop on precision measuring tools like micrometers • How consistent measuring pressure affects accuracy and prevents damage • Difference between measurement indication (reading scale) and mechanical protection features

💭 Think About

• Think about what happens if you keep turning a micrometer harder and harder against the part being measured—what could go wrong? • What function does a ratchet normally serve in hand tools: is it mainly for indicating position, limiting motion, or controlling force? • Which option best matches something designed to protect both the tool and the workpiece during measurement?

✅ Before You Answer

• Verify which choice is related to controlling the amount of force/pressure applied during measurement. • Check if any option incorrectly suggests that the ratchet is part of the measuring/reading mechanism instead of a protection/consistency feature. • Eliminate any choice that describes a function that a separate micrometer part (like the spindle lock or threads) would normally handle.