[mikethedruid]

I have to be honest, it would not have been a tester I would have bought. Looking on eBay, I see a Radio City Products tester currently with no bids,  that I think would have been a better choice.
https://www.ebay.com/itm/Radio-City-Prod...SwZTldo4~m

There is also a Supreme Instruments one.
https://www.ebay.com/itm/Vintage-Supreme...Sw7~RdjkZ4

A couple of Heathkit ones
https://www.ebay.com/itm/Heathkit-Model-...Sw3fFdpOsK

https://www.ebay.com/itm/Vintage-HEATHKI...Sw1pBdp8Ge


and a nice Precision Apparatus
https://www.ebay.com/itm/VINTAGE-PRECISI...SwTNBdp2Iv

Any of these older units are going to need to have their paper and electrolytic condensers replaced before they can be used reliably, including the one you bought. I hope you got the manual with it. You'll need it to know the proper settings for each tube. From the pictures I have seen of this model online, I also don't know if it will test all the types of tubes you may encounter. All of the testers I have linked use a roller chart right in the tester, so you don't have to fiddle with a manual every time you need to set it for a different tube. I own a couple like them myself, and they work well.