Potatohead
Valuable Member
Hi there
I own a ULR 736, and I purchased a 774-11 kit instead of 736-11 because that was what the LFS had. I would imagine they are probably the same thing and they both say online they are set to 100 ppb. However, the analysis paper inside says acceptable result for the checker is between .37 and .43... So this was obviously originally made for the regular phosphate checker 713. 0.4 would translate to 130 ppb.
So my question is - What is the correct standard - 100ppb or .04 (130 ppb)?
I have actually used it twice with two checkers with one checker reading 92 and 96, and the other checker reading 120 and 126, so either one could be correct.
Thanks
I own a ULR 736, and I purchased a 774-11 kit instead of 736-11 because that was what the LFS had. I would imagine they are probably the same thing and they both say online they are set to 100 ppb. However, the analysis paper inside says acceptable result for the checker is between .37 and .43... So this was obviously originally made for the regular phosphate checker 713. 0.4 would translate to 130 ppb.
So my question is - What is the correct standard - 100ppb or .04 (130 ppb)?
I have actually used it twice with two checkers with one checker reading 92 and 96, and the other checker reading 120 and 126, so either one could be correct.
Thanks
