Rhino ULTRA EC Smart Fan Controller with Thermal Probe Fan Speed Controller control freak You can use it as

You can use it as a manual fan speed controller or use an additional 5m temperature probe (SOLD SEPARATELY) to operate the unit as a fully automatic speed controller

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Rhino ULTRA EC Smart Fan Controller with Thermal Probe Fan Speed Controller control freak You can use it asItem Description RHINO EC SMART FAN CONTROLLER Rhino Ultra EC Smart Fan Controller with Thermal Probe can maintain your desired temperature level by automatically adjusting the speed of all connected fans. For use with EC motor fans. KEY VALUES: Simple installation and use Control multiple fans Ultimate fan control