Practical and versatile Designed for traditional refrigerators, freezers, and insulated cooler boxes Front panel features a large color coded temperature indication with blue green white and red zones for easy at a glance reading Accurate temperature range Measures temperatures from minus 30 C to 20 C Clear reading scale helps ensure stored foods stay within the correct temperature range Mechanical design with no batteries Hook type panel that can be hung or placed in multiple positions Reads with a simple mechanical display, no power or batteries required Durable and easy to maintain Made from ABS material for long life and impact resistance Easy to wipe clean and includes a protective lens to keep the display clear Easy installation and wide compatibility Suitable for use in refrigerators and freezers Can be mounted on shelves or walls or hung in place as needed Use scenarios Home kitchen or pantry fridge to verify normal operating temperatures Garage or workshop freezer where temperature may vary and reliable readings are important RV, camping, or office break room cooler to monitor contents without batteries