Vacuum Tube Testing Services?

Make sure you get the manual, some have supplement books 

This one restored, recalibrated

https://www.ebay.com/itm/324626522534?hash=item4b953fa1a6%3Ag%3AwGEAAOSwly1goJvG&LH_BIN=1

Thanks for the suggestions but I am looking to get Gm and Ma results to ensure my output tubes are closely matched and how strong my preamp tubes are performing.  These testers appear to really just test to see if tubes are good or not.   I have approx 15 tubes I needed tested to use or sell and prefer not to buy a tester at this time.

Found a service that sounds promising.  Will give it a go…

https://www.western-glow.com/vaccum-tube-testing-matching/

When I was in high school, I worked in grocery store. We had a tube tester

with a tube cabinet. Back in those dark ages, many stores of all kinds had tube tester cabinets. When the TV went on the fritz, people would pull all the tubes and put them in a sack to bring to the store to tst and replace as needed.