The King 7459 series rotameter is a side plate style construction rotameter with a 250mm scale borosilicate glass tube with aluminum side plates, polycarbonate shield. The connections are vertical FNPT. The fittings and internal components are standard 316L stainless steel. O-rings are available in Viton, Buna N, EPR, and Kalrez.

Capacities range from 0.22 to 100GPM for water and 0.9 to 350 SCFM for air. Accuracy is ±2% full scale, repeatability is 0.5%. Maximum temperature is 200°F (93°C) for liquids and 250°F (121°C) for gases. Maximum pressure varies by size: 350 psig for sizes 3 & 4, 175 psig for size 5, and 125 psig for sizes 6, 8 & 9. Ambient temperature range is 33 to 125°F (1 to 52°C). The meter conforms to ISA RP 16.6.