Hanna Instruments

Scientific Equipment

Safety Data Sheets

SDS search & quick download

Free Delivery

Most of mainland GB for orders over £50. Other charges may apply - see more

Hanna Care

We take the long view, looking after existing customers as much as delighting new ones!

Certificates of Analysis

Download a copy of the certificate of analysis for your solution

HI-733-25 Reagents for High Range Ammonia Pocket Checker

HI-733-25 Reagents for High Range Ammonia Pocket Checker

HANNA HI-733-25 Reagents for High Range Ammonia Pocket Checker

HI-733-25 Reagents for High Range Ammonia Pocket Checker

20 tests
In Stock
£31.60 (exc. VAT) £37.92 (inc. VAT)

HI-733-25 is a pre-made replacement reagent kit for the HI-733 Ammonia High Range Checker® HC. All reagents are manufactured to a high standard with high purity chemicals and clearly marked with the lot number and expiry date.

HI-733-25 Reagents for High Range Ammonia Pocket Checker information

Hanna's extended description

The HI-733-25 is a high-quality, pre-measured reagent allowing users to achieve fast and accurate measurements with their Ammonia High Range Checker® HC. These reagents follow the Nessler Method in which the reaction between ammonia and reagents causes a yellow tint in the sample. By simply adding 9 mL from the first reagent bottle and subsequently 4 drops from the dropper bottle to the sample, the reaction will take place and the HI-733 will determine the concentration from the colour that is produced.

Results will be displayed in ppm (mg/L) of ammonia-nitrogen (NH3-N). These reagents are designed to be used with samples that have an expected range of 0.0 to 99.9 ppm ammonia-nitrogen. To convert the reading to ppm of ammonia (NH3) multiply the result by 1.214.

Bottle size: Reagent A - 30ml, Reagent B - 120ml x 2.

Tip for an accurate measurement

It is important that the sample does not contain any debris.

Whenever the cuvette is placed into the measurement cell, it must be dry outside and completely free of fingerprints, oil or dirt. Wipe it thoroughly with HI-731318 or a lint-free cloth prior to insertion.

Shaking the cuvette can generate bubbles, causing higher readings. To obtain accurate measurements, remove such bubbles by swirling or by gently tapping the cuvette.

Do not let the reacted sample stand for too long after reagent is added, or accuracy will be lost.

After the reading, it is important to discard the sample immediately, otherwise the glass might become permanently stained.

Four steps. One click. Instant Readout.

1. ‘Zero’ the Checker®HC with your vial inside

2. Place a 10ml water sample into the vial and add your reagent

3. Place your vial into your Checker®HC

4. Press the button and read the results


Specifications list


Package Bottles
Quantity 25 tests
Method Adaptation of the ASTM Manual of Water and Environmental Technology, D1426-92, Nessler Method. The reaction between ammonia and reagents.

. - by Neil Rogers

Questions & Answers

Got a question to ask? Use this form to submit your question.
Question will be displayed after moderation.
Name* Product Question*
No questions yet?
Don 't be shy, be the first to ask.