The pH probe is detachable. The tds probe is not.

I don't think it is the probe.

The tds will not calibrate,
and it reads way off from my two other meters.

This trimeter is less than two months old.

Screw the Chinese and their junky electronics.

As long as I have a choice,
I will try to avoid buying chinese crap again.

My Milwaukee meters are made in Romania.