This precision hand-held thermo/hygrometer is ideal for measuring and monitoring ambient temperatures and relative humidity in a wide range of professional and industrial applications. Dual readout LCD displays in degr/F or degr/C, Temperature range/accuracy: 32 to 122 degr/F (0 to 50 degr/C)/1.8degr/F (1 degr/C) ,Humidity range/accuracy: 20 to 95%RH /3%, Response time: 60 seconds, Power source: CR2032 Lithium-ion battery (included)