Extech 445702 Thermo-hygrometer with RH Gauge and Clock shows Time, Temp, and Humidity at the same time; the Clock shows 12/24 hour time. This meter has Max/Min and clear functions, can take Humidity readings of: 10 to 85% RH, Temp readings of: 14 to 140 degrees F or -10 to 60 degrees C, and Accuracy readings of : +/-6% RH; +/-1.8 degrees F, +/-1& degrees C.