Detachable: The thermometer is removable, making the recalibration easy to clean and recalibrate. No battery requirement: Without the need for batteries, the thermometer is economical, environmentally friendly and can simply be attached to the window with a sticker. Highly sensitive precision bimetals: The transparent temperature monitoring measuring device has integrated, highly sensitive precision bimetals for recording the temperature change. Practical - The transparent temperature monitoring meter can be mount to windowpane outdoor, you can reading the outdoor temperature in the room. You can know the outdoor temperature clearly and change your cloth according to the showing data, avoiding catching cold Waterproof - The transparent temperature monitoring meter has good waterproof function, which is not afraid of the bad weather - The thermometer adopts 3mm thickness acrylic as dial and stainless steel as chip shell, which is and wear Usage Method: Step 1: Tear off the protective paper on the double-sided adhesive tape : Paste the product on the glass outside the window or outside the door by backhand Step 3: You can rotate the dial left and right to re-calibrate in small value difference. If the value difference is large in abnormal situation, please pry the back off, there is a calibration screw, you can also recalibrate it. Tips: Please do not place the window thermometer under sunlight directly shines, the light energy be converted into internal energy, which makes higher temperature. You can rotate the dial left and right to re-calibrate in small value difference. If the value difference is large in abnormal situation, please pry the back off, there is a calibration screw, you can also recalibrate it. Measuring range:-40 - 50C (-40-120F) Accuracy:+/-2C Net weight:80.1g/2.83oz Colour:Transparent Material:Acrylic + stainless steel Size:11x2 cm/4.33x0.78inch () Package Contents: 1 * Window Thermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.