Have you used any of these test kits?

I just purchased these test kits online (….. that could be out of place against the lol mine during a move), so buying on impulse .. Stupid, I know .. Saltwater Master Liquid Test Kit Aquarium Pharmaceuticals, (pH, nitrates, nitrites, and ammonia) I forget if there is one more no alkalinity and KH test kit – 100-200-Evidence of Red Sea JBJ Digi-Temp (. thermometer. because mine died) I'm definitely looking at a new hydrometer .. which I have (arm swing … ugh) is total crap!

Yes, I used the AP salt water and like his Master Reef Test Kit (listed below). However, I think by Salifert tests are superior to the AP. Salifert kits I linked below as well. As for the thermometers, the JBJ Digi-Temp is a fairly reliable thermometer. I prefer the Pinpoint Wireless Thermometer (link below). Not sure what is used to measure salinity (density), but a refractometer is the way forward. Hopefully you're not using a hydrometer swingarm. They are notoriously unreliable and susceptible to erroneous readings. Enjoy your marine aquarium, swimmer