Refractormeter Issues

[pyke]

Hi all,

Hoping for some help here, probably something silly. I bought a second hand refractometer. When I initially received it I did a calibration with RO water and then tested my tank water and it worked correctly.

But a few months later, I calibrate the refractometer as I always did with RO water but its not over reading my salinity. My hydrometer shows the correct value but the refractometer is showing in the region of 1.05 when the hydrometer shows 1.024.

Any ideas?

 

[RiaanP]

did it dropped perhaps?

 

[pyke]

I don't think so, by your response this sounds unusual. But is a possibility a it gets stored on a shelf up high