Question - Labeling Tested Tubes

[blueglow]

I have my son home for the summer and he needs a project So, I thought about having him test tubes for a few hours each day.

I've always just used a fine point sharpie and marked each tube near the base on the glass with the gm findings. However, I've found over time they fade a little and get hard to read.

I was curious what others have been using to label tubes? Whatever method, I'd like enough room to list gm values for both sides of triodes, etc. I'm not opposed to stickers, etc., just something that is tried and proven to work well and remain easy to read.

Share your secrets... please...

Mark

 

[RJM1]

You could write it down on a piece of paper and use a rubber band to keep it with the tube.

 

[JonSnell Electronic]

I use a small printed label, Avery 6450, either on the valve base plug or on the glass.

 

[Merlinb]

I use a white Posca pen (basically a pen containing a kind of paint instead of ordinary ink).