For measuring air velocity: volume flow measurements at air condition systems, measuring air velocity in ducts, checking air filter system, measuring the environment conditions at working places and measuring of the energy branch. - Measuring units: m / s, F / pm, Km / h, Mp / h, knot. - MAX-HOLD-AVG-indication. For measuring air velocity: volume flow measurements at air condition systems, measuring air velocity in ducts, checking air filter system, measuring the environment conditions at working places and measuring of the energy branch. - Measuring units: m / s, F / pm, Km / h, Mp / h, knot. - MAX-HOLD-AVG-indication.