The IAQ Observer is a small, secure, easy-to-use indoor air quality monitor available for rent. Weighing less than one pound, it offers tamper-proof testing with key-locked on/off controls and secure lock and cable. Designed for unattended monitoring, data can be easily retrieved through a secure Web site or disk. The time-consuming task of learning to operate the instrument and calibration is not necessary, since programming is included.

KD Engineering Inc., 161 C St., No. 113, Blaine, WA 98230; (781) 856-1790; fax (800) 739-4497.