Poll: How about a WD DIY kit Vacuum Tube tester

[Sid and Coke]

Nothing special and aimed specifically at the types of valves that are used on the current range of WD amplifiers.

When all said and done I'm sure that a commercial Vacuum Tube/Valve tester is just a box with a load of circuit boards and components installed, I bet there is nothing inside one that we don't already have installed in the valve amplifiers that some of us have already built.

A lot of the commercial designs probably have bespoke moving coil meters on them ( I'm thinking of the Good/Bad type here ) , but ultimately what are these meters showing ?
Is it anything that couldn't be reproduced using a stock OEM panel meter, or perhaps a row of Red, and Green LED's, or maybe a Numerical LED panel display.

I'm sure amny of us have bought a job lot of 'sold as seen with no guarantee' NOS valves of unknown quality , maybe with a nice simple metering device would enable the home enthusiast to sort the wheat from the chaff, or quickly test a suspect valve.

So Expert, just how difficult would it be to design and build a basic, functional and useful Valve tester ?

The reason that I'm asking is that commercial designs seem to be very expensive for what they are and what they do, pretty much the same reason that we design, buy and build DIY Hi-Fi amplifiers in the first place.