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Which Hanna Phosphate Checker?


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If you're serious about your PO4 readings, then you should decide between the original Hanna HI736 ULR Phosphorus, or the newer Hanna HI774 ULR Phosphate.  There are some slight differences between these two models.  The HI736 measures Phosphorus, and you need to use a conversion chart to figure out what the actual Phosphate reading is.  But the original HI736 is more precise and has a more narrow range than the HI774 which directly reports the Phosphate reading without any conversion, while the HI774 has a higher range and is slightly less accurate.

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38 minutes ago, MasterChief said:

The 774 is the same as the 736. The 774 does the conversion for you and displays in PPM.  The accuracies of both meters are the same +-5ppb vs 0.02ppm (considering meter resolution...)

the light sources are the same

testing methods are the same

hell even the reagent works in both

 

They are not the same.  The resolution of the 736 is nearly 3x better than the 774:

HI736 = 0.0036066 ppm Phosphate
HI774 = 0.0100000 ppm Phosphate

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52 minutes ago, MasterChief said:

This 👆🏻👆🏻  The 774 and 736 are pretty much the same, the 774 does the conversion for you. 

So you're simply going to ignore the fact that the resolution is nearly 3 times different as I posted above?

2 hours ago, SuncrestReef said:

They are not the same.  The resolution of the 736 is nearly 3x better than the 774:

HI736 = 0.0036066 ppm Phosphate
HI774 = 0.0100000 ppm Phosphate

 

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