Hi Stringreen,
These cartridges are sensitive to .02-.03 grams tracking force changes. Yes, that's not a typo. You should be able to find a few digital gauges in that $100 price range that will give you .01 g accuracy.
You'll find quite a few comments by Doug Deacon and myself on this topic - that you want to be on the threshold of mistracking. Once you get more than say, .05 to .10 grams above this threshold, the dynamics tend to become compressed. I wonder how many wonderful cartridges have been misjudged because of lack of attention to this?
Also, my experiments with arc-style protractors (see my forum - in the Setup and Tweaks section) along with the several active threads on the topic on this forum for a lively discussion. Using an arc-style protractor has been a revelation to me.
One of the side benefits of this more accurate alignment (arc protractor) is that VTA becomes less twitchy. Amen to that!
Mintlp is (according to reliable reports) producing reasonably priced (for one-off work) arc-style protractors and delivering them in2-3 weeks. You can read about all of the details in the above referenced threads.
Enjoy!
Thom @ Galibier