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To recalibrate to within an acuracy of ±1 division, immerse the stem to a depth of at least 3 inches into a slush ice solution (60% crushed ice and 40% tap water, well stirred). Wait at least 1 minute for the sensor to reach equilibrium. If the pointer reads 32F the thermometer is correctly calibrated. If recalibration is required, hold the calibration nut securely with one hand and adjust the thermometer head with the other hand until the pointer reads 32°F.
This Pocket Dial Thermometer can be re-calibrated should it be subjected to shock or extreme temperature changes. To re-calibrate to within ± 1 division, immerse the stem at least 3″ into a slush ice solution (60% crushed ice and 40% tap water). Wait at least one minute for the sensor to reach equilibrium. By holding the unique, hand calibrating nut in one hand, the Thermometer can be adjusted until the pointer reads 32°F, as shown below.