Ambient air and water temperature measuring devices.

1. Ambient air and water temperature measuring devices that are scaled in Celsius (°C) or dually scaled in Celsius and Fahrenheit must be designed to be easily readable and accurate to plus or minus 1.5°C in the intended range of use. 2. Ambient air and water temperature measuring devices that are scaled only in Fahrenheit must be accurate to plus or minus 3°F in the intended range of use.