Package contains: 3 pieces of mini round thermo-hygrometer. Each meter contains one AG13 button battery. Size: 45x45x16mm. Weight: 25g. Display diameter: 24mm. The clear LCD display and big digits make reading easier. Humidity measurement range 10%~99%. Humidity measurement accuracy ±5%. Humidity sampling cycle: 1 minute Temperature measurement range -50°C to 70°C. Temperature measurement accuracy ±1 degree (under normal temperature). ? NOTE: ? 1. Do not put it in water, they are not waterproof. ? 2. And you should better not cover the back, as that's where the sensors are. So for a more accurate measurement, you should better stand it up, or put it on a small stand. This cheap portable thermometer hygrometer is great to put inside the house and check the temps and humidity. Ideal humidity temperature monitor for bathroom, living room, bathroom, reptile tank, incubator, car, cigar room, babyroom, cloakroom, and more. This reptile thermometer and hygrometer is great for monitoring the living environment of reptiles, such as lizards, turtles, snakes, etc.Portable digital LCD display hygrometer thermometer. Display diameter: 24mm. The clear LCD display and big digits make reading easier. NOTE: Do not put it in water, they are not waterproof. And you should better not cover the back, as that's where the sensors are. So for a more accurate measurement, you should better stand it up, or put it on a small stand. This mini temperature and humidity meter is ideal for bathroom, living room, bathroom, reptile tank, incubator, car, cigar room, babyroom, cloakroom, and more. Great for monitoring the living environment of reptiles, such as lizards, turtles, snakes, etc. Package contains: 3 pieces of mini round LCD digital thermo-hygrometer. Size: 45x45x16mm. Weight: 25g. Each humidity temperature monitor contains one AG13 button battery. This cheap little digital temp and humidity meter is great to put inside the house and check the temps and humidity. Humidity measurement range 10%~99%. Humidity measurement accuracy ±5%. Humidity sampling cycle: 1 minute. Temperature measurement range -50°C to 70°C. Temperature measurement accuracy ±1 degree (under normal temperature).