Features: Made of high quality aluminum material,not rust and durable. Automatic sensing, no battery, environmental protection. Can measure temperature and humidity at the same time, very convenient. With a hole on the back to hang up. Suitable to hospital,warehouse,museum,library ,farm etc.Specification:Material:Aluminum+GlassMeasurement accuracy:1C/RHHumidity measurement range:0-90(RH)Temperature measurement range:-20-40CSize:13.2x3cmPackage includes:1 x Two In One BarometerDetails pictures: