The 5cm Metal Hygrometer Adjustable Calibration Pointer Hygrometer is a versatile and reliable tool for measuring humidity levels. With its adjustable proofing on the back, you can easily calibrate it to ensure accurate readings. The hygrometer has a compact 2" diameter, making it easy to install in the reserved hole of a cabinet box. However, it is important to avoid direct sunlight when using this hygrometer to ensure accurate readings. If you have any questions or concerns about our product, please don't hesitate to contact us. Our dedicated customer service team will do their best to provide a satisfactory solution within 24 hours.Key Features:Adjustable proofing for accurate readingsCompact 2" diameterEasy installation in cabinet boxAvoid direct sunlight for accurate readings