The new Apex range of personal sampling pumps has been developed to provide sampling capabilities between 0.005 and 5 l/min. They are suitable for a wide range of applications and offer many advanced features not found in comparable products. Two main models are available in the range; the Apex Standard and the Apex Pro. Ease of use and utmost reliability have been uppermost in the designer’s minds during the development of these quality pumps from Casella CEL. Digital circuitry ensures precise and constant control of the flow rate.