Model RH520 can be either desk or wall mounted and provides simultaneous numerical and graphical displays of humidity (20 to 95 percent RH) and temperature (-20 to 140°F [-29 to 60°C]). It also calculates dewpoint. The multiple graphic displays are cursor controlled and have adjustable X/Y axis resolution that allows the user to monitor both temperature and humidity within a user specified range. The sample rate is adjustable from 0.1 sec to 200 min per sample, permitting daily, weekly or monthly graphs. Basic accuracy is 3.5 percent RH and 1.8°F (1°C).