Maxmoral 2pcs M16 Water Level Sensor Flow Inductance Water Pump Controller DC 110V Side Mount Horizontal Liquid Float Switch for Aquariums Fish Tank Hydroponics Pool : Amazon.ca: Industrial & Scientific
Mini Float Switches | Vertical Liquid Level Switches
Operating Principle of Float and Displacer Level Switches and Sensors ~ Learning Instrumentation And Control Engineering
Phcc Pro Series DFC1 $57.00 NO Caged Dual Micro-reed Automatic Float Switch 120VAC | Zoro.com