This wall-mount or tabletop temperature and humidity datalogger with capacity to store 16,000 readings, is designed to monitor indoor air quality in one compact size unit. It has a large digital triple display and audible and visible alarms. Plus a fast responding sensor and electronics to help monitor the relative humidity and temperature of the indoor air. Data can be further analysed with PC-software provided by setting up these parameters for recording: sample interval timing, start/stop, date and time, hi/lo alarm threshold, unit selection, and number of memory points.