Product Specifications: Size and Weight: front: 2in 0.39in; back: 1.8in 0.39in; Humidity Measurement Accuracy: 22-55 (RH). Accuracy: humidity sensor maintains accuracy of +/- 0.5%. Material: aluminum outer ring, plastic lens, metal bottom case. Package content: 1*cigar thermometer 1.?Design?: Humidity gauge features round disk shape, easy to install in different storage boxes, each is equipped with a rubber ring on the back, which can be directly embedded into the reserved hole of the cabinet, convenient for viewing the internal humidity of the cabinet. 2.?Material?: Hygrometer is made of high grade metal and glass material, noble and exquisite, compact practical.The moisturizing box is made of PV and polymer moisturizing cotton material, which absorbs water quickly and evenly has strong water retention. 3.?Cigar Hygrometer Features?:nbsp; Cigar humidor hygrometer can be applied for measuring the humidity of cigars and effectively detecting the status of cigars, providing favorable conditions for the mature fermentation of the cigar, its humidity error is +/- 5%, accurate and sensitive gauge for you to use. 4.?Durable to use?:These mechanical round hygrometers are made of quality alloy material, durable and anti-corrosion, not easy to break, the pointer is very stable, so you can use them for a long time 5.?Mechanical movement?: Our round analog hygrometer contain a mechanical movement that does not require batteries, so it does not need to replace the battery, very convenient to use.