JUST KIDDING! JUST KIDDING!
But let me be honest, I started with the API Reef Master Test Kit thinking it was a good deal. Don't waste your money!
After realizing it wasn't worth a penny, I set out to find the BEST test kit for each individual parameter. Here's what I use today and I would recommend all of them:
SALINITY: Hanna Salinity Tester
ALKALINITY: Hanna Alkalinity Checker
CALCIUM: Red Sea Calcium Pro Test Kit
MAGNESIUM: Red Sea Magnesium Pro Test Kit
NITRATE: NYOS Nitrate Reefer Test Kit
PHOSPHATE: Hanna Phosphate ULR Checker
I don't test PH (even though I should) because I just haven't found a well-rated product. If anyone has any recommendations, I'd love to hear them.