When to Replace Your Grill Thermometer

Grill lid-mounted thermometers last 3 to 5 years before they lose accuracy. The bimetallic coil inside (a strip of 2 different metals bonded together that expands at different rates) degrades from repeated heating and cooling cycles, heat exposure to 500°F+, and moisture. After a few years, most lid thermometers are off by 25 to 75 degrees... some even more. The problem is you don't realize it's drifting until your food is consistently over or undercooked. Lid thermometers also read the air temperature at the top of the lid, which can be 25 to 50 degrees higher than the temperature at grate level where your food actually sits. So even when new, a lid thermometer gives you an approximation at best. Digital probe thermometers are far more accurate and have their own lifespan. Leave-in probe thermometers (wired or wireless) last 2 to 4 years. The probe cable insulation degrades from heat exposure, and the thermocouple inside the probe tip loses accuracy over time. Instant-read thermometers last 3 to 7 years and are the most reliable because they're only exposed to heat briefly during each reading. The sensor is a thermistor that degrades slowly. Wireless smart thermometers (like ThermoWorks Signals or MEATER) last 3 to 5 years for the probes, though the base unit lasts longer. Probe replacements cost $15 to $30 each. Battery quality and contact corrosion are the typical failure points for the electronics.

Replacing a lid-mounted thermometer takes 2 minutes: open the grill lid, unscrew the wing nut or retaining nut on the inside, pull the old thermometer out from the outside, insert the new thermometer stem through the hole, and tighten the nut from inside. No tools needed beyond your fingers (some nuts are easier with pliers).

If your grill doesn't have a thermometer hole and you want to add one, drill a 3/8" hole in the lid using a metal drill bit. Position it in the center of the lid, 2-3 inches from the top. File any burrs smooth, insert the thermometer, and secure with the included hardware.

Setting up a wireless probe thermometer takes 5 to 10 minutes: install batteries, insert probes into the base unit, pair the transmitter and receiver (usually automatic), insert one probe into the meat and clip the other to the grill grate for ambient temperature. Route probe cables through the lid gap.

Instant-read thermometers need no installation. Just insert the probe into the thickest part of the meat, avoiding bone, and read the temperature in 2 to 5 seconds. Insert at least 1/2" past the dimple on the probe shaft... that's where the sensor is located.