My LFS's spin test was also slightly different (4.9 dKH) than my at home results (5.6 dKH), but close enough to see the trend that my Alk was dangerously low. So I use my at home to watch trends and use the spin tests at the LFS just to double check I am in the right ball park.Tiger conch is amazing. A great addition and constantly grazing. Added a torch marketed as NY knicks. Got a spin test at the LFS and results are very different than my Hanna checkers. Most concerning was alk of 9.7 which is higher than I’m reading. Very nice of LFS to send Hanna control dKH solution home for me to borrow and I checked within range so I’ll not worry about it and just trust the Hanna. They did give me the comment that they don’t check any of their systems with the spin test so there ya go. I was just hoping for something to compare to and confirm against.
They did check my salinity with their digital refractometer and it was spot on compared to where I want to be at. Anywho. Here’s my numbers from today. Won’t include the spin test results here as I don’t think it provides much useful information as it seems to be overall inaccurate.
Salinity: 35ppt
Ca: 440ppm
Alk: 7.9 dKH
Phosphate: 0.07ppm
Nitrate: 1.3 ppm