The humidity-temperature datalogger Model RHT20 is ideal for monitoring humidity and temperature levels in warehouses, storage rooms, freezers, shipping vans, and offices, says the company. It logs 16,000 humidity readings and 16,000 temperature readings with a user-programmable sample rate. The unit features a USB interface for setup and data download and user-programmable alarm thresholds for rh and temperature. The unit contains a selectable data sampling rate (1 second to 24 hours), and the LCD shows current readings, minimum/maximum, and alarm status. The RHT20 features an approximately one-year battery life and comes complete with a 3.6-V lithium battery, mounting bracket with combination lock, and Windows® 2000-, XP-, and Vista-compatible analysis software.

Extech Instruments, 285 Bear Hill Rd., Waltham, MA 02451; 781-890-7440; 781-890-7864 (fax);;

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