Ice cap salinity refractometer

[tang daddy]

I am just curious if anyone on here has purchased one and used it.

I got one awhile back and noticed it was .004 lower than what 2 other hand held refractometer said.

Now we have used 3 different digital refractometers and they’ve all read the same .004 lower than what the other refractometer are claiming.

To be clear 3 tanks at 1.026 when tested with handheld and read 1.022 with the ice cap. The other tank that was 1.025 read 1.021 on ice cap.

On other sites there are people raving its spot on with theirs, wether their using digital or hand held.

I find it hard to believe this is the case so trying to see if anyone has the same problem.