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  • Hanna Instruments Checker HC Handheld Colorimeter, For Phosphorus
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Hanna Instruments Checker HC Handheld Colorimeter, For Phosphorus


List Price: $55.00
Price: $42.80 & FREE Shipping. Details
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Specifications for this item
Brand Name Hanna Instruments
Item Weight 0.14 pounds
Number of Items 1
Part Number HI-736
UNSPSC Code 41112201

The Hanna Instruments HI 736 Checker HC Handheld Colorimeter for Phosphorus is portable meter ... Read full product description



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Product Features

  • 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

Product Details

Spec Sheet [1.49mb PDF]| User Manual [314kb PDF]
  • Product Dimensions: 1.5 x 2.4 x 3.2 inches ; 2.2 ounces
  • Shipping Weight: 10.4 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B003UNK3I8
  • Item model number: HI736
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (13 customer reviews)
  • Amazon Best Sellers Rank: #5,288 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Frequently Bought Together

Hanna Instruments Checker HC Handheld Colorimeter, For Phosphorus + Hanna Instruments HI 736-25 Phosphorus Reagents (Pack of 25) + Hanna Instruments HI 755 Checker HC Handheld Colorimeter, For Alkalinity (1 cuvette, 1 bottle of liquid reagent and 1 syringe - Included)
Price for all three: $99.29

These items are shipped from and sold by different sellers.

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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

Customer Questions & Answers

Customer Reviews

4.5 out of 5 stars
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Most Helpful Customer Reviews

5 of 5 people found the following review helpful By Joe Hand on March 19, 2011
Verified Purchase
Very nice instrument, pretty simple to use, just 3 steps, but be sure to follow the easy directions. Also order 25 extra test powders Hanna Instruments HI 736-25 Phosphorus Reagents (Pack of 25) because you only get 6 with the tester. Seems to be fairly accurate and results are reproducible. Youtube has a nice video by Hanna instruments on how to open and carefully pour the test powder into the vial.
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3 of 3 people found the following review helpful By JB on March 29, 2011
Verified Purchase
Very good checker for phosphorus/phosphate. Only challenge is the 3 minute timer after the initial set-up. You have to have your packet of regeant opened ahead of time and ready to pour in - as you only have 3 minutes to pour in the regeant, shake for 2 minutes, and re-insert in the checker!
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By Samuel Pulis on April 14, 2015
Verified Purchase
This test kit is accurate however it has many flaws. It is unnecessarily very frustrating at times. The thing is that it automatically turns off after a period of time which ends up wasting packets of reagents (which aren't that cheap when you're using lots of them). Let me explain:

First you have to put a vial filled with tank water in the tester and press the button to calibrate. After that you have about 3 mins to dump all the reagent out of its tiny package through the tiny neck of the vial. If you spill some you have to open a new packet, 1 way to waste a packet. Then, if it takes too long to get the stuff out of the packet and get it all dissolved, 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 has to be re calibrated, 2 ways to waste a packet. Then after that you must press AND HOLD the button. If you do not hold, it gives you an instant reading which will not be accurate, 3 ways to waste a packet of reagent. i believe this is meant to skip the timer in case you've messed up you don't have to wait through it (waste the packets faster). In any case, assuming you've done your job well and completed these somewhat tricky steps perfectly, you have a 3 minute timer to wait through before the device displays the correct reading for one minute. If you are distracted during that time and miss that reading for whatever reason, that makes 4 opportunities to waste packets.

This is all unnecessary to me. Why does it have to have packets? Why not just a jar of reagent dust and a spoon? like every other test kit i've ever used that had dry reagent. I feel the packets are wasteful. Why does it have to turn off automatically?
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Verified Purchase
I've been a saltwater aquarium owner for over 12 years and testing water quality using standard titration or color matching drop test kits has always been a laborious and often inaccurate part of regular maintenance. So after reading reviews and experiences of other reef keeping hobbyists I decided to try my first handheld colorimeter. These are allegedly more accurate than standard test kits and eliminates the guesswork of color matching kits. Instructions are quite strict, and reagents are rumored to be of questionable quality, but overall experience has been very good and I like the fact that I can better establish more accurate readings, and more importantly trends, quickly and reliably.

Looking forward to adding the Hanna Instruments saltwater calcium and alkalinity checkers to my collection.
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The HANNA HI 736 Checker is the best tool for measuring phosphate/phosphorus in a reef tank. Also, i recomand, order 25 extra test powders Hanna Instruments HI 736-25 Phosphorus Reagents (Pack of 25) because you only get 6 with the tester.
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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). 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 the meter.

The one thing that I find a bit annoying,is that you have to work quickly with the reagent and sample at C2 stage or the meter times itself out. So, just being prepared by cutting the dry reagent and creating a pocket for that, will solve this for you.

It works quickly and accurately over and over.
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Seems to be very accurate. Hanna needs to extend the power off time as others
have said and there has to be a better way to deliver the reagent, what a pain
those little packets are. You never know for sure if you get all the powder
in the bottle and if you left a few grains sticking in the packet how did this
effect the test results.

One of the bottles in my kit has some scratches on the bottle, not sure if they
are in a place to effect the read or not.

It still beats a test kit by far.
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