The 445815 has a remote probe that can either clip onto the meter or extend on an 18-inch cable, enabling you to take measurements behind walls, in ducts, or other areas that are difficult to access. The meter measures humidity from 10 to 99 percent RH and temperature from 14 to 140 degrees F (-10 to 60 degrees C) with an accuracy of ±4 percent RH; ±1.8 degrees F. The 445815 can be field calibrated with the optional calibration kit and has a rear calibration adjustment pot with max/min and a reset function. An optional NIST Traceable Certification satisfies ISO and other regulatory body requirements for product accuracy and traceability to nationally recognized reference standards.

Ideal for maintaining proper temperature and humidity conditions in factories, greenhouses, and offices, the Extech 445715 Big Digit Hygro-Thermometer can also record extremes (min/max) in temperature during the day. It features a remote probe that can clip onto the meter or extends on an 18-inch (457mm) cable, a dual LCD with large 1-inch digits, the 445715 simultaneously displays humidity and temperature. It has a temperature range of 14 to 140 degrees F (-10 to 60 degrees C), and a humidity range of 10 to 85 percent RH. This thermometer is accurate to 1.8 degrees F and 4 percent RH, with switchable Fahrenheit or Celsius readout. In addition, the unit can be calibrated using the optional calibration salt bottles (RH300-CAL Humidity Calibration Kit).