The 220-HMK41 Calibration Kit includes HMI41, HMP46, NIST traceable certificate of calibration, and carrying case. The HMI41 hand held indicator has an easy-to-read LCD display. Temperature readout is available in either degrees Centigrade or Fahrenheit. In addition to displaying humidity and temperature readings, the HMI41 can calculate dewpoint and wet bulb temperature, absolute humidity and mixing ratio. Calculated variables are available in metric and non-metric. The HMP46 humidity and temperature probe is solid and rugged; its stainless steel probe head is made to withstand rough handling in mechanically demanding applications. These features, plus fast response time, high measurement accuracy and excellent stability, as well as the wide temperature range of the probe, make the HMI41/HMK46 combination an ideal choice for the most demanding applications.