Vtg Alnor Velometer Air Velocity Meter Complete kit w/ multiple attachments

Description

Vintage Alnor Velometer Air Velocity Meter
Complete kit with multiple accessory attachments.
Vintage calibrated and tested label on back.
Recently verified that it registers air velocity flow (not a calibration test). The last three pictures on this listing show a vacuum cleaner blowing against a backdrop to demonstrate air flow measurement (reading on the meter shown).
Please view pictures.
Thank you for looking.