Don’t know how to check the flow rate of the laser circuit with the T-803A temperature controller? This video teaches you to get it in a short time!First, turn on the chiller, and press the pump start button, PUMP indicator on means the water pump activates. Press the button to check the operational parameter of the chiller, then press the button to find the CH3 item, the lower window displays the flow rate of 44.5L/min. It's easy to get it!