Three weeks of sour cups before I checked the water temp

I kept pulling shots that tasted like battery acid, dialed in the grind size like 4 times, swapped beans twice. Turns out my cheap kettle was heating to 190 instead of 200, I only found out because my buddy brought his thermometer over for a cookout. Three weeks of awful morning coffee, and the fix was just boiling longer and letting it sit 30 seconds. Anyone else get burned by a thermometer that reads low on these electric gooseneck kettles?

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