• Mechanical (bi-metal) operation without batteries or liquids • High precision and insensitive to interference • High-quality construction - housing made entirely of stainless steel and glass (no plastic) • Highly decorative and elegant • For hanging or mounting (with removable bracket) • Ready for immediate use and calibration screw for adjustment if necessary • Operating instructions as an attachment to the invoice via email and included with the device • Support for questions regarding application and calibration Note: Our hygro-thermometer is designed for domestic use and provides highly reliable readings within the normal measuring range of 25 to 80% RH. Our device is not suitable for applications in extreme measuring ranges, such as in saunas, steam rooms, etc. As with all analog and digital hygrometers, a certain tolerance must always be taken into account in the accuracy of measurements. With our instrument, this is only +/- 5% relative humidity (RH) or +/- 1°C (temperature).