I used Blackstone but it's been a while for me. So I went to there site and checked. Looks like $35 now. I remember it being around $25 last time I did it so not as big of a hike as I expected.
Keep in mind you probably won't need to do it more than 2-3 times before you establish a good baseline for your intervals. After that you're set.
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2019 Pontiac Heaven class winner
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