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Refractormeter Model RHS-10ATCTh (1 Viewer)

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nanna

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I'm having a problem with my refractometer and hoping someone can help me out. It is calibrated to zero. When I add saltwater from my tank the reading doesn't change. Worked wonderfully last time it was used about 2 weeks ago. I've had this refractometer for approximately 6 months. Any suggestions would be greatly appreciated. Thanks in advance.
 
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