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Hanna HI736 Phosphorous Checker, Ultra Low Range

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Hanna Phosphorous Checker, Ultra Low Range HI736

The HANNA HI 736 Checker HC bridges the gap between simple chemical test kits and professional instrumentation. The HANNA HI?736 is both accurate and affordable.The HI 736 CheckerHC portable handheld colorimeter features a resolution of 1 ppb and 5 ppb 5% of reading accuracy and uses an adaptation of Standard Method Ascorbic Acid.

Hanna Phosphorous Checker, Ultra Low Range HI736.

  • Easier to use and more accurate than chemical test kits

    Ascorbic acid method
    ±5 ppb ±5% of reading accuracy
    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

    Weighing a mere 64 g (2.25 oz.), the Checker®HC easily
    fits into the palm of your hand or pocket
    Use for quick and accurate on the spot analysis
    Single button operation: zero and measure
    Operated by a single AAA battery

  • Ideal for aquaculture (marine applications)


Phosphorus concentration in water is monitored because it causes corrosion when present in levels too high.

The HANNA HI 736 Checker®HC bridges the gap between simple chemical test kits and professional instrumentation. The HANNA HI736 is both accurate and affordable.

The HI 736 Checker®HC portable handheld colorimeter features a resolution of 1 ppb and ±5 ppb ±5% of reading accuracy and uses an adaptation of Standard Method Ascorbic Acid.

The HI 736 Checker®HC is extremely simple to use. First, zero the instrument with your water sample. Next, add the reagents. Last, place the vial into the Checker®HC, press the button and read the results. It’s that easy.

Product Information:
HI 736 Checker®HC is supplied with sample cuvettes with caps (2), powder reagents for phosphorus (6), battery and instructions.

Range   0 to 200 ppb
Resolution   1 ppb
Accuracy @ 25°C   ±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 two minutes of non-use and ten 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 the Standard Methods for the Examination of Water and Wastewater, 20Th edition, Ascorbic Acid method.
Product code: 2498
Item No. TE-HI736

9 Reviews

  • 5
    Awesome Product don't hesitate when purchasing!!!!

    Posted by TJHOWELL on Mar 16th 2018

    I don't know why people would waste any money on other products for testing phosphate. This is hands down the best way to test for it and the most accurate. Very simple, the reagent packets are a little bit of a pain but once you figure out how to get all the powder out its pretty easy. Don't waste anymore more money on other test kits for phosphate just buy it.

  • 5
    Great product

    Posted by Sergey on Jan 9th 2018

    an excellent product, greatly facilitates the life of the aquarist, you no longer have to try to determine the color visually. the reading is 3-4 times more accurate than that of 713

  • 5
    Never buy another po4 kit

    Posted by GnarleyMarley on Jan 6th 2018

    Hands down best low range po4 kit available. I run a 120 sps dominant reef and i like to keep my po4 around 0.02 with this checker there is no more guess work, the digital readout ensures confidence, No more wondering if that color is supposed to exactly match the color card even tho it doesn't. Best purchase in a while!

  • 5
    Easy to use product

    Posted by ABishop on Dec 28th 2017

    Easy to use and accurate. There is no guessing when the color changes or matching a color on a card. A nice digital display.

  • 5
    Accurate and easy to use

    Posted by ABishop on Dec 28th 2017

    This check is great to understand where your phospate numbers. No color to guess when it changes or match to card. Digital reading on you parameters.

  • 4

    Posted by Snuggs on Dec 9th 2017

    Easy and accurate

  • 5
    Great product to monitor Phosphates in the ULNS

    Posted by PiscesPower on Dec 9th 2017

    I love my phosphorus checker. My Triton system runs very low phos and I like to keep a close eye on things, trying to get a little bit of phos but not too much. The ULR lets me manage it without big swings.

  • 5
    Detects phosphate but I don't have any

    Posted by karlandtanya on Jan 12th 2017

    Using the HI713 I never detected any phosphate, so bought this one instead.<br>NOTE--this one is calibrated for *phosphorus*, not phosphate, so is only about 4x as sensitive as the HI713.<br><br>Anhyow, the HI736 still still didn't detect any phosphorus in my tank, so I made a dilute solution of TSP just to see if the thing even detects anything! Short answer--yes, the testers do report phosphorus/phosphate when it's really there.<br><br>Anyhow, the HI713 and the HI736 *do* detect phosphate when it's present but reported more than I expected from my dilution. This was just a sanity check with Savogran TSP cleaner--not lab reagents, so don't expect accuracy (correct numbers)--just precision (repeatable numbers).<br><br>For what it's worth, the HI713 and HI736 did report consistent (repeatable) resultss to 3 significant digits (after correcting for phosphorus/phosphate) when testing from the same sample.

  • 5
    Great product

    Posted by Dan on Apr 9th 2015

    Simple to use and provides a nice easy to read digital read out. I have heard that it may not be as accurate as sme high end photometers but for the price and easy of use it is great and beats the color interpretations of other test kits