Features: Accurate 16-40℃ ranges dry wet bulb thermometers offer humidity monitoring without batteries, perfect for indoor climate track. Shatterproof plastic design with red liquid display ensures durability and readability through bold temperature/humidity scale. Essential for households, office managers, and childcare facilities requiring safe, environmental measurement solution. Fit seamlessly in nurseries, workspaces, or wall mounts. Eliminates battery waste while maintaining precise functionality in diverse indoor setting. Specifications: Component: Plastic Temperature measurement ranges: 16℃ to 40℃ Measurement error: ±1℃ Size: about0 30x4.5x12cm/11.81x1.77x4.72in Package Includes: 1pc Dry Wet Bulb Thermometers note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color. NOT require battery.