Sorry for getting back to this thread after a long time.
Anyway, my question was that in various forums, I always see people telling to measure PPT instead of SG and that's where I am scratching my head. Like does SG scale move up or down and ppt remains fixed? Because as far as I can see, the scale is fixed while for ATC, the metal strip expands or contracts for temperature compensation to show 1.026 - 35ppt ratio. Is measuring SG and PPT the same in a ATC refrac then?
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You wouldn't want to see my tank. I don't use fancy equipment and I am a noob 
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