For both home or industrial use: refrigerators and freezers, perishable food , wine cellars, humidors, nurseries, attics and crawl spaces, workshops, vehicle cargo spaces, ,vacation homes, mold control, manufacturing, warehouses, museums, hvac, refrigeration trucking (cold chain), greenhouses, barns, ,documentation storage, etc. Anywhere you want to know what the temperature is at a specific time period. The pocket size monitor records temperatures by the day for either the first or last 100 days. It monitors temperatures ranging from -5f to +122f (-20c to +50c). Celsius & fahrenheit temps are displayed on lcd screen as floating bar-graph. The unit comes in its own clear plastic waterproof case for humid areas, outdoors or submersing directly into water.