Certified Instrument Specialist (CIS) HSPA Practice Test 2026 – All-in-One Comprehensive Guide for Exam Success!

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Which step strengthens the instrument by heating after initial formation?

Forging

Grinding and Milling

Assembly

Tempering

Tempering is the heat-treatment step used after the instrument has been formed to change its metallurgical properties. By heating to a specific temperature and then cooling, tempering relieves internal stresses and reduces brittleness while preserving hardness, giving the instrument greater toughness and strength in service. Forging is the initial shaping at high temperature, grinding and milling are finishing to final dimensions, and assembly is putting parts together—none of these provide the same post-formation property adjustments as tempering.