RGF has a full line of liquid flow and air flow meters to indicate and manually control flow. The liquid flow gauges are made from solid acrylic with a white background and black letters. All wetted parts are brass or stainless steel. Flow is indicated by a weighted stainless steel tapered cell calibrated for gallons per minute. The air flow gauges are made of durable polycarbonate plastic with black printed flow markings, and an air flow adjustment knob for finite adjustments. Air flow is indicated by a weighted stainless steel ball calibrated in SCFH.