Qty:1
$44.10 + Free Shipping
In Stock. Sold by SaltwaterAquarium

Other Sellers on Amazon
Add to Cart
$44.10 ($44.10 / Each)
+ $4.99 shipping
Sold by: One Way Out Sales
Add to Cart
$49.49 ($49.49 / Each)
+ $10.99 shipping
Sold by: Big Al's Online
Have one to sell? Sell on Amazon

Hanna Instruments HI721 Iron Checker HC Handheld Colorimeter 0.00 to 5.00 ppm Range

4.1 out of 5 stars 11 customer reviews

List Price: $55.00
Price: $44.10 ($44.10 / Each) & FREE Shipping
You Save: $10.90 (20%)
In Stock.
Ships from and sold by SaltwaterAquarium.
3 new from $44.10 1 used from $32.71

Specifications for this item
Brand Name Hanna Instruments
EAN 0013088128610
Number of Items 1
Part Number HI721
UNSPSC Code 41115300
UPC 013088128610

The Hanna Instruments HI 721 Checker HC Handheld Photometer is a portable tester for monitori... See more product details



Product Features

  • Device can be calibrated with water, without purchasing additional solutions
  • Single button operation for ease of use
  • Uses EPA Phenantroline method 315, a reaction that causes an orange tint in the sample
  • Auto-off function to extend battery life
  • Large LCD screen for readability

Special Offers and Product Promotions


Product Details

Spec Sheet [1.12mb PDF]| User Manual [292kb PDF]
  • Product Dimensions: 50 x 50 x 50 inches
  • Shipping Weight: 7.2 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B003IKNJKM
  • Item model number: HI721
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (11 customer reviews)
  • Amazon Best Sellers Rank: #46,821 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Product Warranty: For warranty information about this product, please click here

Frequently Bought Together

  • Hanna Instruments HI721 Iron Checker HC Handheld Colorimeter 0.00 to 5.00 ppm Range
  • +
  • Chelated Iron for for Organic Hydroponic Aquaponics Soluble - 10% - 1 Pound
Total price: $59.09
Buy the selected items together

Product Description

The Hanna Instruments HI 721 Checker HC Handheld Photometer is a portable tester for monitoring iron levels .

The HI 721 bridges the gap between less accurate chemical test kits, and expensive professional test instrumentation. The HI 721 operates using a silicon photocell light detector, and has an accuracy of + or - 0.04 ppm or + or - 2% of reading at 25 degrees C, using an adaptation of Standard Method 3500-Fe B. To use, 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 reaction between the reagent and iron within the water causes an orange tint in the sample.

The HI 721 operates in temperatures from 0 to 50 degrees C (32 to 122 degrees F)/RH max 95% non-condensing with a range of 0.00 to 5.00 ppm (mg/L). The device operates on one 1.5 V 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 weight is 64 g (2.25 oz.).

Colorimeters are used to determine the concentration of a substance in a solution by measuring the amount of light transmitted through the sample, often after adding a reagent. Iron colorimeters are used in water and soil analysis to monitor iron in ground water and industrial, agricultural, and mining run-off.

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 a pH electrode with a built-in temperature sensor, an electronic pocket-sized pH tester, and a replaceable electrode pH pocket tester. To ensure the quality of their products, Hanna is a vertically integrated manufacturer and does not subcontract any part of its manufacturing.

What’s in the Box?

  • Two sample cuvettes and caps
  • Six powder reagents
  • One 1.5V AAA battery
  • Instructions

Customer Reviews

Top Customer Reviews

Verified Purchase
Length: 4:01 Mins
I often verify the readings from this device with a much more expensive Hach DR/890. The readings were very close every time that I checked (within 5%, with typical differences within 2%).

The biggest challenge for me was to get the reagent out of the powder pillows. It's a technique one develops with time.

Work above a disposable surface (paper towel) or one that's easily cleaned. You will spill reagent powder and/or water.

1. with the pillow in a vertical position, lightly "massage" it to make sure there is no powder in the upper part;
2. cut the pillow about 1cm below the top (ignore the printed line); make sure you hold the pillow away from you, don't breathe the powder that may come off when you cut;
3. bring the corners of the pillow together, while pinching open the lips and forming a diamond shape; this is the most difficult step and will take practice;
4. pour the powder patiently in the cuvette, tapping the powder pillow lightly against the cuvette; at first it will be difficult to avoid reagent spills but in time you will get better.
As shown in the video, do steps 1-3 before anything else so you don't have to worry about time.
3 Comments 10 of 10 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
I get good results with this thing ( i duplicate one sample per day between two meters, and my readings are within the margin of error (+/- 0.04 i believe). The top end is 5 mg/l, so if you need to go higher, look elsewhere.

My gripes are:

1) Has an auto-off setting, and if you're trying to get the reagent to dissolbe (manual recommends 2 minutes of shaking) it might turn off, AFTER youve zerod with an unreacted sample. So you better have a second vial ready with unreacted sample, or you're hosed.

2) The powdered reagents are difficult to get out. I use this method:

My method is to cut off the top (after ive pinched and flicked the packet to make sure all the powder is away from the cut line), open the entire packet till the only seal remaining is on the bottom, fold the packet longways (perpendicular to the bottom seal) and pinch the bottom half closed into a "v" where the powder can collect.

Once you get the method down, it works OK, but what I wouldn't give for a liquid reagent...
Comment 5 of 5 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
This little thing has helped my Aquaponics system produce green and lush plants. The readings vary by a few hundredths but it is plenty accurate for my needs. The only negative thing I have to say is they do not include many powder packets and a third bottle would be very nice.
Comment 2 of 2 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
Other reviews about difficulty of using powdered regent are on point. My work around is to put a small funnel (really small) in the sample bottle, dump in the powder squishing the tiny packet until all of the regent is in the funnel. Then I add water to be tested using a pipette to wash the powder out of the funnel and precisely fill the test bottle. Works well.

The sample bottle and added powdered regent have to be shaken intermittently for three minutes. After that time elapses, I put the second sample bottle filled with water from the source to be tested in the iron tester for calibration. Then, the test sample goes in. I set an external timer for 3 minutes. I have forgotten to check after the three minute tester countdown. It powers off automatically requiring a retest if you miss the results. A kitchen timer fixes that problem.

Nice to be able to test iron in my aquaponics system. This is a nutrient that is supplemented since it is not naturally present in fish tank water.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
Works great. I used a 5PPM standard and it came dead on. I have to say that the paper packs of the colorimetric reagent are poorly made. I hope they can include a jar that you can scoop from instead of the "splenda" type packaging. Anyway, good product at a great price
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
Very difficult to obtain accurate readings. The reagent is extremely difficult to get out of the package. Since the meter is absolutely dependent on the amount of reagent in the measured amount of water it is almost impossible to get consistent readings.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Want to discover more products? Check out these pages to see more: hanna electronic tester, iron water test, iron test