Self-adhesive window: the transparent temperature meter can be mounted on the outside glass, you can read the outside temperature in the room Removable: the thermometer is removable, which makes recalibration easy to clean and recalibrate No batteries required: without batteries, the thermometer is economical, environmentally friendly and can simply be attached to the window with a sticker Very precise bimetallic Sensitive: The transparent temperature monitoring meter incorporates highly sensitive precision bimetallic strips to record temperature change Tips: Please do not place the window thermometer under direct sunlight, light energy will be converted into internal energy, which increases the temperature. You can rotate the dial left and right to recalibrate in small value difference. If the value difference is large in abnormal situation, please take off the back, there is a calibration screw, you can also recalibrate it This door and window thermometer is a type instrument pointer, and the inside is a bimetallic sheet that is highly sensitive to the temperature change of the sensing environment. Product Name: Outdoor Door and Window Thermometer Product Description : The product uses a 3mm thick transparent acrylic plate as the thermometer dial, the watch core is covered with a stainless steel case and 3M double-sided tape. 'prevent rain and can accurately and quickly measure the outdoor temperature. Product parameters: dial diameter: about 11cm. Temperature measurement range: -40 ~ 50C, accuracy +/-2C How to use: wipe the outside of the glass of the window or the p orte with a cloth, tear off the protective paper on the double-sided tape of the product, hold the product, and stick the product on the glass outside the window or door. with your backhand. Close the window or door and you can read the outside temperature while indoors. Cleaning method: The 3M double-sided sticker is a plastic fastener. The product can be removed from the plastic fastener. After removing the dirt on the dial, the product can be easily fixed.