Fluke flk cnx 3000 wireless digital multimeters and kits fluke fluke flk cnx 3000 hvac the fluke cnx 3000 hvac wireless heating and air conditioning test system comprises the tools you will need to diagnose complex hvac issues quickly and efficiently in commercial and industrial settings it is based around the core cnx 3000 wireless multimeter which can display its own readings plus those from up to 3 measurement modules the system kit also includes a cnx a3000 wireless current clamp module