Voltcraft hygrocube temperature humidity voc monitor with clock voltcraft hygrocube 55 the voltcraft hygrocube 55 is a decorative and functional addition to the modern home or office it measures relative humidity from 20 to 90 rh and temperature from 9 9 to 70 deg c and will warn if there is a danger of mold formation it has a detachable table housing which makes it into a cube without this it is only 40mm thick making it suitable for wall hanging the hygrocube 100 55 2113 is also