The Phoenix HMI-41 precision thermohygrometer is designed to spot check relative humidity, temperature, dewpoint, and grains per pound. According to the manufacturer, this unit incorporates sensors that are accurate to within 2 percent and are insensitive to dust and most chemical contaminants. The Phoenix-HMI-41 offers user-selectable sampling and stable performance in an airstream, says the company.

Therma-Stor, 2001 S. Stoughton Rd., P.O. Box 8050; Madison, WI 53708; 608-222-5301 or 800-533-7533; 608-222-1447 (fax);

eProduct #189