Ok, well in that case my Bondhus drivers don't have that either.He means when he is looking down at the driver handle he wants to see the size on the end cap. So if he puts them hanging down in a tool cart or similar he can tell the size.
I love the tips on Wiha and the soft finish handles but they aren't marked. So my next choices would be Snap-on if you can stomach the price or Tekton. Two ends of the price spectrum but they both mark the caps. Too bad everyone doesn't do it.

I have the Proto Duratek set. Tips are excellent, handles are nicely shaped and impervious to any shop chemical you're likely to use and they're marked on the ends.
https://www.zoro.com/proto-screwdriver-set-torxr-9-pc-j1209st/i/G5291185/
Not sure what you mean by 'ends marked', but I do like my Bondhus. Made in USA. Lifetime guarantee. What's not to love? (green ones are torx)
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PB Swiss 8400 Series Torx
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I have the Proto Duratek set. Tips are excellent, handles are nicely shaped and impervious to any shop chemical you're likely to use and they're marked on the ends.
https://www.zoro.com/proto-screwdriver-set-torxr-9-pc-j1209st/i/G5291185/
If your going to go for a T handle set i would recommend instead going for a torx 1/4" socket set and a spinner t-handle like this;
Makes running stuff in and out quick, and you can put a decent amount of torque on them.
You can also use them with 1/4 bits.
Wont fit down tight recesses but handy to have.
Like the others said, PB Swiss, Proto, Wera are all great.

ive, Bondhus are good, but the handles don't appear to be marked like you want. We used Bondhus clear/red acetate regular handle ball end hex drivers, and dipped and non-dipped t-handle straight and ball end hex drivers at the print shop I worked in. They withstood being used while dunked into plate processor chemical tanks and nearly shoulder deep, i.e., non-finessed, into presses and bindery equipment. I was pleased enough with them to have ordered a few of the yellow dipped t-handle hex drivers like in WWheeler's pic for the set screws in my hole saw arbors.
I'd confidently assume Bondhus torx are every bit as good as Bondhus hex.
Any links to amazon on these?
I would go for the Wera or the Tekton USA ones. The other suggestions like the Duratek ones are going to get expensive.
...Proto is a full 9 pc set. If you can meet the $100 order threshold, you can use the 20% off coupon at Zoro and get the set for around $60.