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In order to keep accurate records of temperature, your meter must be reliable and properly calibrated. Hanna calibration plugs provide a quick and easy way to test the accraccy of the meter. If the reading differs by more than 0.8°F (0.4°C) from the plug value, return the unit to your nearest Hanna dealer for recalibration. Choose the calibration plug that best suits your needs:

Item # Temperature
HI 762 Calibration Keys
HI 762-18C -18°C ±0.4°C
HI 762000C 0°C ±0.4°C
HI 762070C 70°C ±0.4°C
HI 762-004F -0.4°F ±0.8°F
HI 762032F 32°F ±0.8°F
HI 762158F 158°F ±0.8°F
HI 765 Calibration Keys
HI 765-18C -18°C ±0.4°C
HI 765000C 0°C ±0.4°C
HI 765070C 70°C ±0.4°C
HI 765-004F -0.4°F ±0.8°F
HI 765032F 32°F ±0.8°F
HI 765158F 158°F ±0.8°F