Randy's Refractometer Calibration Summary

[Boomer]

Recently we have been worried about reefers using and assuming that the refracts that ever one has been using in this hobby should be off - 1.5 ppt or -.15 % or - .0015 SG. We have been telling people in short to raise the seamix "15 units" higher to = 35 ppt ( to read 36.5), 3.5 ( to read 3.65 and 1.0265 A( to read 1,0280).

Thes tests have been completed on a number BUT the SAME brand refracts. These are the ones on the below imgage. Low and behold, they should read these values on a good lab refract and would need these adjustments but about 95 % of the ones reefers are using are off from the fractory that exact amount we are correcting for :lol:

So it apears that with the these Chinese refracts, zeroed to RO/DI water, that they are right on when tested to a seawater std, when thney should not be. So it it reads 35 ppt, 3.5 % or 1,0265 no adjustment is needed to our suprise. Just use as is

Note: This is only for these reracts !!

RHS-10ATC

 

[NaH2O]

Thanks Boomer! I'm confused, though....I checked the box my refract came in and it says RHS-10ATC, but it doesn't look like that. Should we be looking at a particular brand name? This is mine: Premium blue Refractometer

*edit - Boomer edited his post to show the correct refract

 

[Boomer]

Sorry my error the Blue ones are Xiamen Ming Xin Instrument Company and use the same model munbers It is the blue one we see in this hobby. The image I gave, or those RHS-10ATC that are black, are from Huake Instrument Co., Ltd. All those tested are the blue Xiamen Ming Xin

I edited that post

Your scale should look like this