The IAQ Observer is a rental-only indoor air quality monitor. It is designed for unattended monitoring. It measures and records CO2, CO, temperature, and relative humidity. According to the company, this small (less than 1 lb), secure, easy-to-use unit offers tamperproof testing with key-locked on-off controls and security lock and cable. Data is retrieved through a secure website or disk. Weekly rental pricing includes shipping and programming.

KD Engineering Inc., 161 C St., Ste. 113, Blaine, WA 98230; 781-856-1790; 800-739-4497 (fax); (website).

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