The Spot Check Thermometer has a long reputation of being an excellent and reliable thermometer for incubation and calibration. If you have an old unit, it can be used to ensure your machine is operating within desired parameters, or used in a new machine to monitor conditions inside. New Spot Check Thermometers include a battery and are ready for use. Readings can be taken in Farenheit or Celsius. The operational range is limited to 32-43 degrees Celsius to preserve accuracy.
Battery replacements should be LR-44, S-76, A76, G13 or equivalent 1.55v button cell. These are available at most electronic supply stores.