The Extech 44550 is a pen style humidity and temperature meter. Featuring a dual LCD for simultaneous display of relative humidity and Temperature (°C/°F switchable). Measures humidity from 20 to 90%RH and temperature from 14 to 122°F (-10 to 50°C) with ±5%RH; ±2°F, ±1°C accuracy. Pocket sized for quick and reliable measurements at any location. Max/Min memory functions for display of highest and lowest readings for both measurements.