Well, finally got a reply back from Digmesa about the FHKU series flowmeter with integrated thermal probe - 938-3870/AV244 - that Marci linked the PDF spec to above.

Quote Originally Posted by Digmesa Sales
We thank you for your interest in below flow sensor, which you could
purchase directly from us. Unfortunately we will be obliged to send against
pre-payment.

The price for this flow sensor is EUR 390.70/unit
Delivery By Post approx. 20 EUR
VAT, custom fees etc are not included.
I'm sure it's good, but not THAT good!