The Model 2441 is especially convenient for Industrial Hygiene and HVAC measurements. It is a very sophisticated micro-processor version of the widely used and appreciated Series 440 Portable Air Velocity Meter. The 2441 uses the well-known "CD" dual-sting ceramic sensor mounted in a 1/4" diameter, 13" long sensor support with a sensor shield/extender. It includes an all-metal display module, battery charger, carrying case, many options and accessories.