Features 1. 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. 2. High accuracy: our analog humidor hygrometer can be applied for measuring the humidity and effectively detecting the status, providing favorable conditions for the mature fermentation, its humidity error is +/- 5%, accurate and sensitive gauge for you to use. 3. Features: the 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. 4. 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. 5. Scope of application: home, handicraft inlay, cigar box / cabinet. Specification Material: Alloy, Acrylic Color: Brown Size: 57 x 16 mm Weight: 14 g Humidity range: 0%~100% Measurement accuracy: Wet soil 5% (40-70%) Package Include: 1 Cigar Hygrometer