Your search for "thermal mass flowmeter" revealed the following:

Fluke 9100S Handheld Dry-Well temperature calibrator for portable temperature calibration
Fluke Calibration 9100S Handheld Dry-Well
$2,670.00
No reviews
Fluke Calibration 9103/9140 Field Dry-Well Temperature Calibrator
Fluke Calibration 9103/9140 Field Dry-Well
$2,640.00
No reviews
Fluke 568 Ex Intrinsically Safe Infrared Thermometer
Fluke 568 Ex Intrinsically Safe Infrared Thermometer
$434.00
No reviews
Endress+Hauser Prosonic FDU91 ultrasonic sensor for non-contact level and flow measurement
Endress+Hauser Prosonic FDU91 Ultrasonic Level Sensor
$1,000.00
No reviews
Endress+Hauser Prosonic FDU92 ultrasonic sensor for long-range non-contact level measurement
Endress+Hauser Prosonic FDU92 Ultrasonic Level Sensor
$1,000.00
No reviews
Endress+Hauser Prosonic FDU93 long-range ultrasonic sensor for non-contact level measurement
Endress+Hauser Prosonic FDU93 Ultrasonic Level Sensor
$1,000.00
No reviews