Phosphorus Ultra Low Range Colorimeter HI736 Hanna Checker - Marine Water

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Phosphorus Ultra Low Range Colorimeter HI736 Hanna Checker - Marine Water

83% Recommend this to a friend (5 of 6)

SKU: 208630
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Quick Overview

Monitoring phosphorus concentration in saltwater is important because it can cause corrosion if levels are too high. The Hanna HI736 Checker HC Handheld Colorimeter for Phosphorus ULR bridges the gap between simple chemical test kits and professional instrumentation. Accurate, affordable and easy to use. First, zero the instrument with your water sample. Next, add the reagents. Last, place the vial into the Hanna Phosphorus Checker, press the button and read the results. Done.

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Full Details

Hanna Checker Phosphorus High Range Manufacturer's Manual

Hanna Checker Phosphorus High Range Manufacturer's Literature


  • Easier to use and more accurate than chemical test kits
  • Large, easy to read digits Auto shut-off
  • Dedicated to a single parameter
  • Designed to work with HANNA's reagents
  • Uses 10 mL glass cuvettes
  • Small Size, Big Convenience
  • Fits in the palm of your hand


  • Range: 0 to 200 ppb
  • Resolution: 1 ppb
  • Accuracy: ±5 ppb ±5% of reading
  • Light Source: LED @ 525 nm
  • Light Detector: Silicon photocell
  • Environment: 0 to 50°C (32 to 122°F); RH max 95% non-condensing
  • Battery Type: (1) 1.5V AAA
  • Auto-off: After 2 minutes of non-use and 10 seconds after reading
  • Dimensions: 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5")
  • Weight: 64 g (2.25 oz.)
  • Method: Adaptation of Standard Method for Examination of Water and Wastewater, 20th edition, Ascorbic Acid method


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6 Items

  • Easy to use, worth the price! By Jwill275 on 1/18/2016

    Easy to use, open reagent before pressing button 2nd time, gives you more time to empty reagent and mix. I always seem to have a small amount of residue in bottle but I'm very happy with results so far
  • Not for the Dain Bramaged By HANNAbanana on 9/21/2015

    Mine works great, consistently, and flawlessly. Just be careful, slow, and I have found that it helps to roll the test vial horizontally to help get rid of microbubbles before testing, if not, can cause the problems that most complain about. Also, cut the reagent packet on 2 sides.
  • poor function design By northerner on 9/3/2015

    Very difficult device to use . Preparing the meter for sample testing is a crap shoot ( meter responds different every time ) , resulting in many wasted samples and time. The powder packets are a little difficult to use and the results are probably accurate if you ever get the meter set-up. Not user friendly.
  • Great results, poor design on regent By Zane on 8/19/2015

    The test works great and gives you very accurate results. I would've given it 5 stars if it was not for the absolute poor design on the regent. As many others have stated getting the regent into the vial without losing or missing some is almost impossible. The regent should come in something similar to the salt packets at Wendy's or other fast food chains. That way it would be rip the top, then pour into the vial with no chance of losing some of the regent. It would take a simple, but easy change to make this product perfect and more accurate since all of the regent would make it's way to the vial.
  • Good test By Scott on 4/16/2015

    I think this is a great option for measuring the low phosphate levels typically found in a reef tank. Make sure you read the direction 'carefully'. I did not and ended up wasting 3 tests of the 6 that come with the tester. I also think they need to get rid of the packets of reagent. Those things are a pita. Hard to get all of the powder out and hard to make sure what you can get out ends up in the jar. That being said, I would still buy it again today and give it a 4 star rating.
  • Very accurate By Jason on 11/30/2014

    I just received mine in the mail and it works great! It's very easy to use and best of all you can read the results. I have never been able to tell what my phosphate levels were using shades of blue test kits.

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