Dwyer Instruments Rate-Master polycarbonate flowmeter, designed for measuring the flow rate of liquid water.It features a 2-inch scale with a specific measurement range in cc/min (cubic centimeters per minute), likely within the 200-2500 cc/min range common for this series.The meter includes a stainless steel valve at the bottom for controlling the flow rate.Would you like me to identify the specific model number based on the range marked on the scale?