Salinity testing do I Trust Hannah or Tropic Marine High Precision Hydrometer?

[DenverSaltyFarm]

For years I have been using the Hannah handheld tester for salinity and recalibrate it every month with the Hannah calibration solution. My tank reads 1.026 with the Hannah. I just recently purchased the High precision hydrometer from BRS which is saying my tank is at 1.0275

I recalibrate the Hannah in the solution reading 1.026 then right away into my aquarium and it reads 1.026

Should I just stick with the hydrometer and stop using the Hannah reader?

 

[Dbichler]

I have both and used Randy’s solution for salt measurement and with high precision hydrometer it’s exactly on. My hanah pen is always .02 low. So I use the pen for quick checks and precision for water changes. I trust the hydrometer more but pen gets me close enough and doesn’t swing. Just assume it’s always low.

 

[MrPike]

Use both, good to double check each other. The hydrometer is good at 77 degrees, you will need to look at a chart outside that range but it’s not a huge difference.

 

[Randy Holmes-Farley Verified Community Expert]

For years I have been using the Hannah handheld tester for salinity and recalibrate it every month with the Hannah calibration solution. My tank reads 1.026 with the Hannah. I just recently purchased the High precision hydrometer from BRS which is saying my tank is at 1.0275

I recalibrate the Hannah in the solution reading 1.026 then right away into my aquarium and it reads 1.026

Should I just stick with the hydrometer and stop using the Hannah reader?

I expect that difference is within the expected error of these two devices, so I would not agonize too much over which, if either, is more accurate.

Given the uncertainty, I might target the average of the two to ~1.0265.