Compact indoor/outdoor digital thermometer designed for accurate, low‑maintenance temperature monitoring. Key benefits and why you need it Clear temperature readout in Celsius or Fahrenheit: switch between units instantly to match your preference or regional standard. Simultaneous indoor and outdoor displays: monitor conditions in two locations at once to spot trends and take action quickly. Ultra low power for long-lasting use: runs on a 5V AAA battery (not included) to minimize battery changes and downtime. Practical for sensitive storage and everyday comfort: helps protect temperature-sensitive items and improves living or work environments. Main features and performance Celsius / Fahrenheit display: easy toggle for convenient, accurate measurement. Indoor / outdoor temperature display: side-by-side viewing for quick comparison. Power: ultra low power consumption powered by a 5V AAA battery (battery not included). Wide application and compatibility: suitable for home, office, school, experiments, hospital settings, and tea storage monitoring for Pu'er collectors. Practical use cases Pu'er tea storage: verify and maintain stable temperature conditions to protect aging tea and support consistent storage testing. Home and office comfort: place indoors and outdoors to compare conditions before opening windows, running heating/cooling, or adjusting humidifiers. Labs and classrooms: monitor ambient temperatures during experiments or demonstrations where accurate, parallel indoor/outdoor readings matter. What it delivers Reliable, easy-to-read temperature data in your preferred unit. Low‑maintenance operation with extended battery life. Versatile placement across a variety of environments without complex setup. Note: Battery is not included.