I was impressed by the quality and accuracy of the refraction. I brought one over 15 years ago when it cost me nearly $200.00 to maintain the Los Angeles spa and coral. This hinge plate is broken. I tested this, same water, and the results were exactly the same. Then I tested both again with the test solution, both were dead. I paid more but didn't get more. No, if this one lasts that many years, someone else will say (: But it's very accurate and well made.
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