Overheard a guy at the scrap yard say heat treat is 90% eyeballing, got me thinking

I was dropping off some old farrier tools in Tulsa yesterday and heard this older smith tell his apprentice that he'd never used a thermometer, just watched the color and judged by the shadows on the steel. He said his first 50 knives were garbage but he learned more from one cracked blade than any class he took. Does anyone else trust their eye over a digital readout, or am I just being stubborn about trying a proper kiln?

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