Salifert and Seachem. Hard to rely completely on one or the other. I have two Salifert Alk tests and they test about 0.8 dKh apart. I just take the averages between Seachem and Salifert on Calcium, Alkalinity, and Magnesium.
Calcium - Salifert and Seachem
Alk - Salifert and Seachem
Mag - Salifert and Seachem
Phos - Seachem
Nitrate - Salifert
Ammonia - Salifert
Iodine/Iodate - Salifert
Strontium - Salifert
Ph - Hanna Meter
ORP - Hanna Meter
SPG - Oceanic Hydrometer
Calcium - Salifert and Seachem
Alk - Salifert and Seachem
Mag - Salifert and Seachem
Phos - Seachem
Nitrate - Salifert
Ammonia - Salifert
Iodine/Iodate - Salifert
Strontium - Salifert
Ph - Hanna Meter
ORP - Hanna Meter
SPG - Oceanic Hydrometer
