Please choose the correct solution to the question: How are slip gauges made?

Solution1: Most of the slip gauges are produced from high grade steel, hardened and stabilized by heat treatment process to give a high degree of dimensional stability

Solution2: Most of the slip gauges are produced from high grade steel, hardened and stabilized by a laser treatment process to give a high degree of dimensional stability

Answer format: solution1/solution2
Answer: solution1