This company makes a complete line of tapeless measuring devices for many applications, including hvac. The manufacturer suggests its DMS series is ideal for measuring air volume for hvac. The units come in sizes as small as around the size of a candy bar. Other models have added features including laser sighting, low battery indicators and much more.

Zircon Corp., 1580 Dell Ave., Campbell, CA 95008; 408/866-8600; fax 408/866-9230.