Amazon.com: G1/4" Inline PC Water Cooling Flow Meter, Temperature/Flow/Speed OLED Display Digital Coolant Flow Indicator with Alarm for Desktop PC Water Cooler System : Electronics
M-FLOW
Vortex Shedding Flowmeters for Cooling Water - Flowmeters.com | Universal Flow Monitors
CVG Glass Tube Variable Area Flow Meters, For Automotive
Flow Sensors / Flow Meters | KEYENCE America
INS-FM16 Coolant Flow Meter
Vortex Shedding Flowmeters for Cooling Water - Flowmeters.com | Universal Flow Monitors