Space-saving wall mount with clear display Designed for wall hanging, the unit installs easily and occupies minimal space. The built-in air hole allows airflow inside and outside the housing, promoting faster, more reliable sensing while a large screen provides clear, easy-to-read temperature and humidity values. Battery-free operation for maintenance-free use Uses a physical temperature detection mechanism that requires no batteries or power source. This eliminates battery replacements and ensures continuous monitoring without interruption. Accurate dual measurements Measures temperature from 20 to 120 °C and relative humidity from 0 to 100% RH. Performance specifications: ±2 °C temperature accuracy and ±7% RH humidity accuracy, delivering dependable readings for environmental control and safety checks. Practical, versatile applications Suitable for monitoring conditions in archives to protect paper and records, in saunas to track high temperatures, and in bathrooms or offices to control humidity and comfort. The compact, wall-mounted format fits small rooms, closets, storage areas, and utility spaces. Why this product matters Helps prevent moisture damage, preserve sensitive materials, and maintain safe temperature ranges without the hassle of batteries or complex installation. The airflow-optimized design and large display make it easy to check conditions at a glance. Quick installation and placement tips Hang at eye level on a wall away from direct heat sources or vents for best results. The air-hole design performs best when the unit is exposed to the room air rather than enclosed behind glass or inside cabinets. Specifications summary: wall-mounted, large display, air-hole design for improved airflow, battery-free physical temperature detection, temperature range 20–120 °C (±2 °C), humidity range 0–100% RH (±7% RH).