Dwyer Rate-Master® Model RMB with 5 in. scale. Accuracy ±3% of full scale. Tapped for ¼ in. pipe connection. For pressures up to 70 psi. Used to indicate or manually control air or gas flow from 0.1-1800 cu. ft./hr., or water flows up to 8 gal./min. Body, bezel, and flow tube are an integral piece, which has been injection molded of polycarbonate around a precision tapered pin. Stainless steel mounting bracket. Dual range in English & metric available on some models. Range, to be selected from list below, must be provided at time of order. Price is dependent on fittings and range seleted. Enquire about price when ordering. Specifications: RMB-49: 0.5-5 scfh Air, RMB-50: 1-10 scfh Air, RMB-51: 2-20 scfh Air, RMB-52: 5-50 scfh Air, RMB-53: 10-100 scfh Air, RMB-54: 20-200 scfh Air, RMB-55: 40-400 scfh Air, RMB-56: 50-500 scfh Air, RMB-57: 60-600 scfh Air, RMB-82: 1-12 GPH Water, RMB-83: 1-20 GPH Water, RMB-84: 4-40 GPH Water, RMB-85: 10-100 GPH Water, RMB-50D: 1.2-10 scfh/0.6-5 l/min Air, RMB-51D: 3-20 scfh/1.5-9.5 l/min Air, RMB-52D: 4-50 scfh/2-23 l/min Air, RMB-53D: 10-100 scfh/5-50 l/min Air, RMB-54D: 20-200 scfh/5-95 l/min Air, RMB-82D: 1-12 GPH/0.06-0.76 l/min Water, RMB-83D: 1-20 GPH/0.065-1.25 l/min Water, RMB-85D: 10-100 GPH/0.8-6.2 l/min Water.