The Model 446580 humidity/temperature datalogger measures from 10% to 95% rh with 3% accuracy via a capacitance sensor; temperature measurements, via a semiconductor sensor, range from -4Â° to 140Â°F (-20Â° to 60Â°C), says the company. Both humidity and temperature are displayed simultaneously. Data hold freezes the readings. The built-in memory stores up to 7,000 measurements at sample rates of 1 to 65 sec, the company says. Data with date and time is transferred to a PC via the RS-232 interface.
Extech Instruments Corp., 285 Bear Hill Rd., Waltham, MA 02451-1064; 781-890-7440; 781-890-7864 (fax); firstname.lastname@example.org (e-mail); www.extech.com (website).