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Hanna Instruments HI736 Phosphorus Ultra Low Range Checker HC for Saltwater Aquariums

4.4 4.4 out of 5 stars 166 ratings

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Purchase options and add-ons

  • More accurate than chemical test kits, less expensive than professional testing
  • Accuracy of + or - 5% using an adaptation of Standard Method Ascorbic Acid
  • Single button operation for ease of use
  • Large LCD screen for readability
  • Auto shut-off to prolong battery life

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 50 x 50 x 50 inches; 0.71 ounces
  • Item model number ‏ : ‎ 1197H96EA
  • Batteries ‏ : ‎ 1 AAA batteries required.
  • Date First Available ‏ : ‎ July 6, 2010
  • Manufacturer ‏ : ‎ Hanna Instruments
  • ASIN ‏ : ‎ B003UNK3I8
  • Customer Reviews:
    4.4 4.4 out of 5 stars 166 ratings

Product Description

The Hanna Instruments HI 736 Checker HC Handheld Colorimeter for Phosphorus is portable meter for measuring phosphate levels.

The HI 736 bridges the gap between less accurate chemical test kits, and expensive professional test instrumentation. The HI 736 operates using a silicon photocell light detector, and has an accuracy of + or - 5% using an adaptation of Standard Method Ascorbic Acid. To use, simply zero the instrument with your water sample, then add the reagent. Place the vial into the checker, press the button, and read the results within seconds.

The HI 736 operates in temperatures from 0 to 50 degrees C (32 to 122 degrees F)/RH max 95% with a range of 0 to 200 ppb with precision + or - 5% ppb at 25 degrees C. The device operates on one 1.5V AAA battery, with an auto-off function that shuts off the device after three minutes of non-use. Dimensions are 81.5 x 61 x 37.5 mm (3.2 x 2.4 x 1.5”) and weighs 64 g (2.25 oz.).

Orthophosphates are present in water from the natural weathering of mineral deposits, agricultural runoff, untreated sewage, animal waste, fertilizers and as a corrosion inhibitor in drinking water. Phosphate photometers are used by researchers, manufacturers, and individuals to monitor phosphate levels in the environment, and in the home.

Hanna Instruments manufactures a wide variety of analytical instrumentation, including pH meters, multi-parameter meters, electrodes, chemical reagents and buffer solutions. Founded in 1978, Hanna is headquartered in Woonsocket, RI, with subsidiaries in 32 countries. Hanna Instruments holds many firsts in the field of analytical instrumentation, including the world’s first pH electrode with a built-in temperature sensor, electronic pocket-sized pH tester, and replaceable electrode pH pocket tester. To ensure the quality of its products, Hanna is a vertically integrated manufacturer and does not subcontract any part of its manufacturing.

What’s in the Box?

  • Sample cuvettes with caps (2)
  • Powder reagents for phosphorus (6)
  • Battery
  • Instructions

Product guides and documents

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Customer reviews

4.4 out of 5 stars
4.4 out of 5
166 global ratings

Customers say

Customers like the performance, accuracy, and phosphorus reading of the lab supply. For example, they mention it's a great product, easy to use, and reliable. That said, some complain about the value and auto turn off.

AI-generated from the text of customer reviews

17 customers mention14 positive3 negative

Customers like the performance of the lab supply. They say it's a great product, easy to use, and has good results that are repeatable. Customers also say it works well, is reliable, and a quality test kit. They like that it comes in a sturdy case with 2 vials and reagents.

"...I can do 4 different tests in under 10 minutes and have good results that are repeatable and match what I expect after dosing." Read more

"I find this device to be both consistent and reliable(I actually test against my red sea pro test kit to confirm it's reagent viability)...." Read more

"Great product and easy to use" Read more

"Very nice instrument, pretty simple to use, just 3 steps, but be sure to follow the easy directions...." Read more

13 customers mention10 positive3 negative

Customers like the accuracy of the lab supply. They say it works quickly and accurately over and over. They also appreciate the digital readout that is precise and steady. Readers mention that the reading is about 4 times more accurate than using the phosphate unit. Overall, they find the product to be consistent and reliable.

"...If you do this and use them properly you get consistent accurate results and the real beauty is that you don't have to look at anymore color charts..." Read more

"I find this device to be both consistent and reliable(I actually test against my red sea pro test kit to confirm it's reagent viability)...." Read more

"Ignore the grumblers, its a fast and very accurate device. When testing use both vials, one for the sample and one for the reagent and sample...." Read more

"This test kit is accurate however it has many flaws. It is unnecessarily very frustrating at times...." Read more

5 customers mention5 positive0 negative

Customers find the phosphorus reading of the lab supply to be accurate. They also say it's the best option for reading phosphate levels and a good tool for measuring phosphatid in a reef tank.

"...All in all this item is still the best option for reading phosphate levels but be aware of the quirks and buy one of those 25 packs of reagents..." Read more

"Very good checker for phosphorus/phosphate. Only challenge is the 3 minute timer after the initial set-up...." Read more

"...It will tell you more accurate readings of phosphate...." Read more

"The HANNA HI 736 Checker is the best tool for measuring phosphate/phosphorus in a reef tank...." Read more

13 customers mention9 positive4 negative

Customers are mixed about the ease of use of the lab supply. Some mention it's pretty simple to use, with just 3 steps, and the test is much easier to perform than the old school stuff. Others say it'll be a pain in the butt to use and frustrating at times.

"...you don't have to look at anymore color charts and the test are so much easier to perform than the old school stuff...." Read more

"...It only comes with reagents for 6 tests and the test is so easy, that you should just include another set of reagents in your order upon purchase of..." Read more

"...It is unnecessarily very frustrating at times...." Read more

"...So easy with no confusion...." Read more

4 customers mention0 positive4 negative

Customers are dissatisfied with the value of the lab supply. They mention that it's cheap, not rugged, and pricey compared to other testers. Some customers also say that the meter is made of cheap plastic.

"...if i remember correctly i used them all the first day because several were wasted." Read more

"The meter is cheap plastic. I have bought many of these. The lid hinge easily breaks...but this is not a fatal injury...." Read more

"There are many options for phosphate testers. This Hannah tester is kind of pricey compared to other testers...." Read more

"This product is crap. So hard to use. It comes with some pouches u need to tear open and you never get the full amount inside the vial...." Read more

3 customers mention0 positive3 negative

Customers are dissatisfied with the auto shut off feature of the lab supply. They mention that it automatically shuts off after a period of time. Some say that the product does not work properly and shuts down during testing.

"...which takes more than half of the 3 minutes you get, the tester automatically shuts off and since your water sample has reagent in it and the test..." Read more

"...for 2 minutes between steps 1 and 2 and the unit is designed to automatically shut itself off after 2 minutes...." Read more

"...Unit would not work properly, either shut down during testing or gave me a result of 200...." Read more

Much better than guessing what color a reading is on a chart!
3 Stars
Much better than guessing what color a reading is on a chart!
After years of guessing what the readings are based on my eye looking at a chart, i decided to purchase one of these. Although I am satisfied with it, I feel that Hanna just didn't care enough to make the product better in terms of usage as if they would have for one of their laboratory instruments, thereby making usage more effort involved than it should be.Likes: digital readout that was precise, carry case, battery included, 6 reagent packets.dislikes: battery cover removal will drive you crazy because it it requires a small screwdriver that is not included plus the battery cover is electrically connected via a DIP header therefore it takes muscle and forceps to remove easily; The battery cover would be more useful if it had a grip or protruded because it is recessed.The flip-open lid has a 0.015" tall so you might bend a fingernail backwards opening the case.not mentioned in the literature is that this device is not waterproof in any sense and placing the instrument flat on a surface will allow surface tension to wick up any water into the battery case.You also should store a small lint free cloth in the case because one is not included, but you can order separately as HI31318. If you intend to make more than 6 measurements, you better pre-order the reagents (HI-736-25 a 25 count pack). I have yet to know how well rinsing with reverse osmosis water will maintain the cuvettes, but it appears you can buy cuvette cleaning solution (HI93703-50) because it is not included.A few minor changes would have made this device much more user friendly, but it does the job at a fair price. At least I will never need compare chart colors for strips or tubes again.
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