The THA2 is a multi-function product that monitors temperature, humidity and dew point, provides alarms for out of range conditions and continuously logs data. No computer setup is needed. Digital display. Log up to 170 days of data. Relay contacts for remote alarm or auto dialer (ADTA). PC software included. Serial port connection (for USB connection use optional USBS adapter). Remote sensor up to 300'. Applications: food markets, convenience stores, supermarkets, restaurants, florists, greenhouses, laboratories, pharmaceutical storage facilities, refrigerated transport, cold storage facilities and computer rooms. Stand alone front panel operation, with user lockout for security. PC software is provided with the unit for viewing data history. Sensor probe specification: -40 degree F to 140 degree F operating temperature range, 0 to 95 percent RH, non condensing operating humidity range, +/- 2 degree F, 0.1 degree F or degree C temperature resolution, +/- 2 percent RH humidity accuracy, 0.1 percent RH humidity resolution, user calibration for temperature and humidity, measures 3-51/64" length by 1-3/32" diameter, 300' maximum cable length 15' included. Base unit specification: 32 degree F to 130 degree F operating temperature range, 0 degree F to 130 degree F storage temperature, 0 percent RH to 95 percent RH, non condensing operating humidity, 12V to 24 VAC/VDC, 0.78W alarm active power source, 9V alkaline battery for 35 hours operation during power outage battery backup, CR2032, 10 years typical clock battery, N.O and N.C dry contact 5A 250V, resistive load relay, measures 5-1/2 length by 1-19/32" width by 4-1/2 height. Alarm specifications: High and low temperature and humidity alarms, condensation alarm, user selectable, up to 2 hours alarm delay, audio, visual and a relay for remote alarm and phone dialer alarm indication.