Refractory was reading high....

dz6t

Acro Garden, BRS Sponsor
BRS Sponsor
BRS Member
I have found many people had low salinity recently due to mis calibrated refractometers. The problem all came from these meters’ user manuals called for calibration using RODI or distilled water. When these meters were calibrated with distilled water, they read high when using 35ppt calibration standards.
I am using a Refractometer calibrated with 35ppt standard and cross reference to a calibrated Hanna salinity checker.
Also, it can be a good idea to calibrate your salinity probe frequently if you are using one.
 

dz6t

Acro Garden, BRS Sponsor
BRS Sponsor
BRS Member
How do you calibrate the refractometer the first time?
 

Rafanho

Non-member
I calibrate mine with rodi water and also with the 35ppt fluid...and both way work perfectly for me
 

dz6t

Acro Garden, BRS Sponsor
BRS Sponsor
BRS Member
I calibrate mine with rodi water and also with the 35ppt fluid...and both way work perfectly for me
Because you happen to have a good one.
Many cheaply made ones need to be calibrated with saltwater standard.
 
March Monthly Meeting

Featuring Keith Berkelhamer
(YouTube's ReefBum)

Wednesday March 10, 2021
7 PM On Zoom!
Top