AquaKey Posted April 5, 2021 Share Posted April 5, 2021 I don't find my Red Sea Phosphate kit to be very accurate... Going to buy a Hanna checker but which one? 736? 774? And if anyone has one for sale I'm all ears Quote Link to comment Share on other sites More sharing options...
sharambil Posted April 5, 2021 Share Posted April 5, 2021 I heard ULR is good for long term use. Not sure how that correlates with the numbers. Quote Link to comment Share on other sites More sharing options...
obrien.david.j Posted April 5, 2021 Share Posted April 5, 2021 (edited) I use Nitrate Low Range Colorimeter HI781. No view which is best. Edited April 6, 2021 by obrien.david.j Quote Link to comment Share on other sites More sharing options...
dunpeal Posted April 5, 2021 Share Posted April 5, 2021 Same as Dave said. Want mine? I never use it 1 Quote Link to comment Share on other sites More sharing options...
AquaKey Posted April 7, 2021 Author Share Posted April 7, 2021 @dunpeal rocks! Got a phosphate and alk checker + some frags, thanks! 2 Quote Link to comment Share on other sites More sharing options...
markv Posted April 7, 2021 Share Posted April 7, 2021 You want HI774 Ultra Low Range Phosphate PPM Checker. Quote Link to comment Share on other sites More sharing options...
SuncrestReef Posted April 7, 2021 Share Posted April 7, 2021 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. 1 Quote Link to comment Share on other sites More sharing options...
SuncrestReef Posted April 17, 2021 Share Posted April 17, 2021 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 1 Quote Link to comment Share on other sites More sharing options...
Oregonic Posted April 17, 2021 Share Posted April 17, 2021 I love my hannah PPM checker, I believe it is the ULR checker. I dont want to have to convert numbers. Hannah is also the easiest for testing PO4 in my opinion. Quote Link to comment Share on other sites More sharing options...
SuncrestReef Posted April 17, 2021 Share Posted April 17, 2021 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 Quote Link to comment Share on other sites More sharing options...
pdxmonkeyboy Posted April 17, 2021 Share Posted April 17, 2021 Milwaukie phosphotometer is more accurate but many times the cost. You can always print out the conversion table for the more accurate meter to convert it. The only thing the hi774 can do is measure the phos levels way outside the range you would want for a coral tank. Quote Link to comment Share on other sites More sharing options...
markv Posted April 21, 2021 Share Posted April 21, 2021 I was surprised at how heated this topic got and originally didn't want to add to it. But I couldn't understand why Hanna would update the 736 to the 774 and lose so much accuracy. I looked at SuncrestReef's details in his initial post and came to a different conclusion. Range: 736 is .00 to .6132 ppm phosphate; 744 is .00 to .9 ppm phosphate Accuracy: 736 is .01533 ppm phosphate; 744 is .02 ppm phosphate Reading resolution: 736 is .003066 ppm phosphate; 744 is .01 ppm phosphate Conclusion: the 736 is more accurate, by just over 30%; the 744 has a wider range, extending the range from .6132 to .9, both of which are greater than needed.; the resolution, or size of each digit that displays on the meter doesn't matter as it is smaller than the accuracy of the digit displayed; the 736 requires conversion of the number displayed to get ppm phosphate. I chose the 744 because it is easier to use and sufficiently accurate for me. I can see why others would prefer the 736. 1 Quote Link to comment Share on other sites More sharing options...
Manny Tavan Posted April 21, 2021 Share Posted April 21, 2021 People still measure phosphate? Haven’t checked in months Quote Link to comment Share on other sites More sharing options...
youcallmenny Posted April 21, 2021 Share Posted April 21, 2021 3 hours ago, Manny Tavan said: People still measure phosphate? Haven’t checked in months GFO reactor? Quote Link to comment Share on other sites More sharing options...
Cobalt Posted April 22, 2021 Share Posted April 22, 2021 Am I the only dummy who bought the 713? My phosphate was at 0.12 when I checked it yesterday. Yes too high... but thats why I got it 😂 Quote Link to comment Share on other sites More sharing options...
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