The Extech 44550 simultaneous measures and display relative humidity and temperature.The temperature unit is °C/°F selectable.

It has  max/min memory functions which display the highest and lowest readings for both temperature & relative humidity. The Extech 44550 humidity/temperature pen also features a "clear" function key which erases stored max/min readings to record new values.

It ships complete with pocket clip and one LR44 button battery.

Features

        Humidity: 20 to 90%RH (±5%RH)
        Temperature: 14 to 122°F or -10 to 50°C
        Accuracy: ±5%RH; ±2°F, ±1°C
        Max/Min with "Clear" function

• Sensor Type: Resistive-ceramic thermistor
• Humidity Range: 20 to 90%
• Resolution: 1% RH
• Basic Accuracy: +/-5% RH
• Temperature Range: 14 to 122F (-10 to 50C)
• Basic Accuracy: +/-2F/1C
• Resolution: 0.1F/C
• Dimensions: 5.9"x0.8"x0.7" (150x20x18mm)
• Weight: 0.7oz (20g)