Using this thermometer is a breeze. First, make sure the battery is installed. Then, insert the 5 - inch probe into the food you want to measure. Wait a few seconds for the clear LCD display to show the accurate temperature. For best results, keep the probe away from bones when measuring meat. When it comes to cleaning, since it's water - resistant, you can gently wipe it with a damp cloth. Just avoid submerging it for too long. Store it in a dry place when not in use. If you notice inaccurate readings over time, you can calibrate the thermometer according to the instructions. Also, replace the battery when the display becomes dim or the readings seem off.