The Bel-Art Scienceware 199350000 clear polycarbonate flow indicator provides immediate visual indication of the flow rate and direction of water and other liquids. The indicator has a nylon ball housed in clear polycarbonate housing that rotates in a circular channel during flow. An arrow indicates direction. Continuity and relative flow rate are indicated by the speed of the balls rotation. The indicator requires a minimum water flow rate of 100mL per minute in a horizontal position and 140mL per minute in a vertical position and has an upper flow limit in excess of 1 liter/minute. The maximum working pressure is 10 psig (pounds per square inch gauge ) or 69 kN/m2 (kilonewtons per meter squared). The polycarbonate indicator is 30 x 57mm (11/5 x 2-1/4 inches) (H x W) and has two 23mm (0.9") tube extensions to accept 6.4mm (1/4") to 9.5mm (3/8") inside diameter (I.D.) tubing. Bel-Art Products manufactures scientific products, including labware, testing equipment, and safety supplies, under the Bel-Art and Scienceware brands. The company, founded in 1946, is headquartered in Wayne, NJ. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.