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Accurate Temperature Measurement: This outdoor temperature gauge offers precise -50℃ to +50℃ measurement with 1℃ accuracy, capture real-time temp changes, delivering reliable data for outdoor activities. Clear Reading: This external thermometer for outdoors features a red-blue dual-color dial for clear positive and negative temp distinction, enabling quick, at-a-glance reading from inside the house. No Power Operation: This window thermometer outdoor stick on operates using bimetallic simulation technology, requiring no battery power. This avoids wiring near windows or frequent battery changes. Durable and Robust: This set of 4 compact 7.5x7.5cm outside thermometer window won't block light; made of weatherproof PS material, it resists rain, sun, frost and harsh weather for long-lasting outdoor use. Easy Installation: This weatherproof outdoor thermometer uses self-adhesive design, no drilling or surface damage needed; install quickly after window cleaning, easy to remove for glass care.