Which Hannah PO4 test to buy?

[Scrubber_steve]

I've been using the Salifert PO4 test kit which is not at all decisive if targeting a specific range as the test card color for 0.03ppm is barely decernable from 0.25ppm.

So I'm contemplating buying a Hannah checker & I believe the most suitable for my purpose is the Phosphate low range 0.00 to 2.50 ppmillion phosphate which is in the range of Salifert only digital & accurate & decisive.

However, I believe some people use a different Hannah, possibly the Marine Phosphorus Ultra Low Range which is 0 to 200 ppbillion but I don't think this is as suitable?

Am I on the right track?

[LQT]

I own and prefer the Phoshorous ULR checker and it is more accurate at the low range reading phosphorous in PPB, a simple conversion will get you the phosphate reading. The Low Range Phoshate checker at very low ranges always read 0 for me so I got rid of it. This BRS video will shed more light on the subject.

https://youtu.be/6SFMWRG0fRM

[bertoni]

I agree that the Phosphorus ULR Checker is more useful at the low end of the range. For people with stony corals in their tanks, the ULR model might be more appropriate. Most often, stony corals seem to do better with lower levels of phosphate where the ULR unit is more precise and accurate.

[Scrubber_steve]

Originally Posted by LQT

I own and prefer the Phoshorous ULR checker and it is more accurate at the low range reading phosphorous in PPB, a simple conversion will get you the phosphate reading. The Low Range Phoshate checker at very low ranges always read 0 for me so I got rid of it. This BRS video will shed more light on the subject.

https://youtu.be/6SFMWRG0fRM

Thanks for posting that video. I've changed my mind

[Scrubber_steve]

Originally Posted by bertoni

I agree that the Phosphorus ULR Checker is more useful at the low end of the range. For people with stony corals in their tanks, the ULR model might be more appropriate. Most often, stony corals seem to do better with lower levels of phosphate where the ULR unit is more precise and accurate.

Thanks

[homer1475]

After watching that BRS video, I will be shelving my phosphate tester and buying the ULR phosphorous tester.

Thanks for the video LQT.

[ant123mon]

I agree the Hannah phosphate tester isn’t accurate at high range or low. I just started using mine today and already scraped them. I have a phosphorus too, but ordered the Milwaukee phosphate digital checker hopefully that works better. Wrong readings can really screw stuff up.