Model Number: 4810 – Radio transmitter & data logger[/vc_column_text][vc_column_text]The Hanwell 4000 series of radio transmitter units are well established as being the most flexible on the market today. The RL4810 air flow unit is a reliable 4000 wireless transmitter with air flow sensor that provides users with the tools for preventative maintenance within refrigeration units, filtration systems and air handling systems etc.