I think I got at least 3 entries in,
Currently using a refractometer from Amazon
And a cheap thermometer from Petco XD
Phosphate have a Red Sea test kit but don’t check too often
Bonus;
I currently measure no salinity. This would be for my first reef tank! As for temperature, I don’t have anything. This is why I realllllly need to win this giveaway.
I currently use an IR temp gun and old fashioned glass thermometers for temp. A Marine Depot refractometer for salinity. I rarely measure phosphate, but use the Seachem test kit when I do.