Overall score is based on:

Accuracy (60%) We assess accuracy using a calibrated thermal bath. When the thermal bath reaches 70℃ a reading on each thermometer is taken. A reading of -/+ 1℃ gets an accuracy score of 8.0, a reading of -/+ 2℃ scores 5.0.

For thermometers that claim to be oven-proof, we check how accurate the reading is at 70℃ while cooking scotch fillet. All were within 2℃ of the calibrated reading. This didn’t contribute to the overall score.

Ease of use (40%) We check how easy it is to use and read the thermometer, insert the probe, and clean the thermometer.

Price is from an October 2018 survey.