Practical and versatile temperature indicator for traditional refrigerators, freezers, and insulated boxes. A large color coded display with blue, green, white, and red zones on the panel makes the temperature easy to read at a glance. Measuring range and readability Measures refrigerator temperature from 30 to 20 degrees Celsius to meet different requirements. Clear reading scale helps ensure food is stored at the correct temperature. Design and power Hook type panel design can be hung or placed in different positions. Instant readings with a mechanical design; no battery power required. Durability and maintenance Made of ABS for durability and long life. Easy to clean with a protective lens. Compatibility Suitable for use in traditional refrigerators, freezers, and insulated boxes. Use scenarios Home kitchen: use in a refrigerator or freezer to verify temperature after stocking or door openings. Portable cooling: place in insulated boxes or portable coolers for picnics, camping, or travel to monitor safe storage temperatures. Small commercial or office settings: quick visual checks in storage areas to confirm proper temperature without electronics.