Which speed sensor
Signet, NKE, Airmar ?
Which one is better (linearity, sensitivity,..):
Signet Blue Top vs. Red Top (Is there any quality difference between them, beside the output format)
NKE electromagnetic vs. ultrasonic
Airmar ST650 vs. CS4500 vs. DX900+
any sensor I've missed beside the Nortek DVL?
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Has anyone first hand experience on Airmar Gen2 paddle wheels. These look similar to old Silva/Nexus and Signet?