Tool for timing tapes: any available for various tape types ?

[david winter]

Hi,

I recently found a nice little plastic tool (pictured below) which tells you how long your tape lasts by putting it next to the central core (bobbin).

This this tool only works with 52 micron tapes like PER525 and PER528, I wondered if anybody knew about a more generic tool like the one I have, which can time the most common tapes according to their thickness.


Thanks,

David.