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Rwpdunne
01/23/2012, 02:17 PM
Hi all I'm going to treat myself to a Hanna p04 checker which one is better
HI 736 or the HI 713

Thanks Robbie

sponger0
01/23/2012, 04:23 PM
For saltwater tanks, IMO you want to go with the one for the low end.

kriv4o
01/23/2012, 05:43 PM
I was reading up on that just yesterday and found out that the 713 has 4ppm give or take in the results(the reading could be + or - 0.04ppm than the actual value). One of the guys stated that algae needs 0.03 and above ppm to develop so in your system you should be aiming at the 0.03 range. With 4 points of inaccuracy it would be harder to use the 713 That's why whenever I am ready to spend the money I am getting the 736 as it has a smaller rate of inaccuracy and the price is almost the same.

chuckdallas
01/23/2012, 10:44 PM
The 736 reads PHOSPHORUS with an accuracy rate of 0.03 parts per billion in phosphate so to convert to everyone else's language, you need to know that 3 on the 736 is 0.03 in ppm. The 713 reads phosphate with an accuracy of 0.04 ppm. I bought the 736 for the better accuracy, even though I have to divide the PHOSPHORUS reading by 3 and multiply by 1/1000 to get ppm (really, it's 2.8 but who can tell the difference at ppm or ppb) to get a good phosphate reading in ppm, which is the measure everyone uses (not phosphorus). So get the 736 for better accuracy because you are smart (can divide by 3 and know that 6 equals 0.02 ppm) and want better accuracy or get the 713 because its reads in ppm for phosphorus and you don't have to think about reading. The difference in price is about $15 for better accuracy, i think. I love my 736 and wouldn't ever go back to the API, Red Sea or Aquos test kits where I guess if the color is blue, slightly blue, more blue or lot of blue.

DrBegalke
01/23/2012, 11:23 PM
Hi 713

Rockys_Pride
01/24/2012, 12:27 AM
The 736 reads PHOSPHORUS with an accuracy rate of 0.03 parts per billion in phosphate so to convert to everyone else's language, you need to know that 3 on the 736 is 0.03 in ppm. The 713 reads phosphate with an accuracy of 0.04 ppm. I bought the 736 for the better accuracy, even though I have to divide the PHOSPHORUS reading by 3 and multiply by 1/1000 to get ppm (really, it's 2.8 but who can tell the difference at ppm or ppb) to get a good phosphate reading in ppm, which is the measure everyone uses (not phosphorus). So get the 736 for better accuracy because you are smart (can divide by 3 and know that 6 equals 0.02 ppm) and want better accuracy or get the 713 because its reads in ppm for phosphorus and you don't have to think about reading. The difference in price is about $15 for better accuracy, i think. I love my 736 and wouldn't ever go back to the API, Red Sea or Aquos test kits where I guess if the color is blue, slightly blue, more blue or lot of blue.

+1, HI 736. The calculation is easy. Just remember that it's in ppb (don't freak out like I did when it read 1.7).

Rwpdunne
01/24/2012, 01:27 AM
Thanks guys I'll be going with the HI736

sahin
01/24/2012, 03:33 PM
Definately go with the HI736. I have one and love it. - Very consistent.