You can find out your degrees by dividing the ppm always by 17.86. For example let's average you at 160ppm. That would give you 8.95 so say 9 degrees. You can do the same for ph and gh and so on.
I really do not like test strips. I only use the liquid tests. API is really good and you can usually see pretty accurately what it is.
The two best things to do are get a drop checker with solution as mentioned and check your ph right before co2 comes on and then an hour or so later when the lights will come on. You typically want a 1pt ph drop which should give you roughly 30ppm. Remember it's not exact and the drop checker will take a couple hours before reading what the actual co2 level is.
I found the best and easiest way is to get a ph pen. This once calibrated will give you very precise measurements and will save you test kit $ in the long run. All you do is get a API kh test kit. Measure your kh. Then use the ph pen. Then go to http://aquariuminfo.org/co2calculator.html
and punch in your ph, kh. It will tell you your ppm co2. Super easy. Here is a link to the ph pen I got that is one of the best investments for my planted tank. Mine was already calibrated. I verified it.
Jellas Pocket Size PH Meter / PH Tester / Mini Water Quality Tester for Household Drinking Water, Hydroponics, Aquariums, Swimming Pools, PH 0-14.0 Measuring Range, 0.1PH Resolution (Yellow) https://www.amazon.com/dp/B00YBUH4RC..._.J4mzbAFJ3B07
And the API kh test kit. API CARBONATE HARDNESS TEST KIT Aquarium Water Test Kit https://www.amazon.com/dp/B003SNDDAU..._4K4mzbKR1RQTJ
So in a nutshell $20 will clear up all of the confusion for you so you can get to co2'ing
I know I jabbered on about more than you asked but maybe you could use the info like I sure did when I first went high tech.
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