Profile: Casella Measurement Ltd. is a manufacturers of noise monitoring and air quality equipment. Our product line includes noise, air, and gas monitoring equipment. Our CEL-320 series noise dosimeter & sound level meter feature pre-configured setups with international noise at work standards with a dual functionality, and can also be used as a sound level meter. Our Apex™ personal sampling pumps feature a large and reinforced LCD display with a rapid drop-in charger and outstanding run times.