Is it worth keeping?

[gorkyb]

Hello drrhein, I've also done compression tests without WOT by accident and it did affect the reading. I would follow the procedure down to the t before you make any conclusions, just to be sure.

I also had a bad ISC and it drove me around in circles for a couple of months, so replacing this with a good one will help you a lot I'm sure.

Don't just give up on your rust free (I'm jealous) Trackick!