Features: This round electronic hygrometer and thermometers features a clear lcd display, providing precise temperature and humidity readings for optimally environmental monitoring. With a compacts design of 41mm in diameter and lightweight at just 25g (excluding battery), it offers a humidity measurement ranges from 10% to 99%. Ideal for homeowners, hobbyists, and professional who require accurate environmental data for maintaining ideal condition in various setting. Perfect for use in terrariums, greenhouses, or any enclosed space where monitoring temperature and humidity is important for plant or animal care. Easy installation with embeddedly mounting and poweredly by a single AG13 button cell, this device ensures reliable performances with a temperature accuracy of ±1°C under normal conditions. Specifications: Component:Plastic Size:Approx.25.8x41mm/1.02x1.61inch Color:Black/White Package Includes: 1pcs Digital Hygrometer note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.