facebook    twitter    linkedin




Business cooperation

Are you interested in a business cooperation with HANNA Service?

For more information click HERE or contact us by phone or e-mail!


Check advices from experts and useful information on our blog!


Latest article on the blog

Measuring pH in shampoo

Published 18. December 2015

Shampoo is a hair care product used for removal of dirt, dandruff, skin particles, oils and other contaminated particles.

As the scientists behind hair care progressed, manufacturers synthesized chemical additives for use in shampoo as fragrance, foaming agents, and colored dyes. Shampoo is now created and structured towards various hair types, as well as to achieve a certain end result, such as the reduction of dandruff or greasy hair. Both the synthetic and natural ingredients used in a shampoo dictate the pH of that particular product. The pH of a shampoo will alter the natural pH of skin and hair, which ideally falls between pH 3 and 5 and pH 4 and 5, respectively, thereby affecting their physical and chemical makeup.


Top 5 Tips to Consider When Calibrating Your pH Meter

Published 24. September 2015

Reliable pH measurements are essential to virtually any process or industry, from soil to wastewater. Measuring pH plays a crucial role in determining the quality of water, soil, and more.

5 tips on calibration

A vital step in getting accurate results is calibrating your meter. But how do you know when calibration is necessary or why your readings are off? Today we will provide you with a list of tips to consider when you are calibrating your meter whether it be the first time or the one hundred and sixty-eighth time!

1. Always read your manual

Calibration procedures change based on which meter is used. In order to best understand your specific meter, it is important to read the manual when you receive your pH meter

2. Make sure you have all of the necessary pH buffer you need

When performing a pH calibration it is important that the appropriate buffers are used. For example if you want to measure something with a pH of 9 and you only calibrate your pH meter to pH 7 you may not get an accurate measurement. This is because pH measurements are most accurate when calibration points bracket the measurement. You should also check your buffers expiration date and how long the buffer has been open for. Some buffers, like the pH 10 buffer expire much sooner than the expiration dates once they are opened. 

3. Calibrate Often

For the most accurate measurement it is suggested that you should calibrate your meter every time you perform a new set of measurements. Calibration can also help identify a problem with your electrode. We suggest calibrating your meter:

  1. Upon first use
  2. After a long period of storage
  3. When performing a new set of measurements.

4. Be aware of your Slope and Offset

Your slope and offset have a significant impact on the condition of your electrode. Hanna Instruments recommends that the offset does not exceed ±30mV and that the slope percentage is between 85-105%.

slope and offset

If you have a bad offset, this could mean that you either have a clogged junction or that the probe requires cleaning.  If this occurs, try soaking the probe in cleaning solution and repeat the process of checking offset.  If your slope is bad, this could mean you have used expired or contaminated buffers.  If this is the case ensure that fresh buffers are used. Many of our meters will display both the slope and offset once calibration is complete. Some of our meters also come equipped with CAL CHECK™.  This feature provides indicators to potential problems during the calibration process, based on previous offset and slope values, allowing you to quickly solve the problem.

5. Electrode Care

Electrodes play an important role in taking measurements and must be handled carefully. pH electrodes should never be stored in DI water as this damages the sensing glass of the pH electrode and reference electrolyte. Instead, storing your electrode in proper storage solution can help to ensure that your electrode provides stable and highly responsive readings due to well-hydrated bulb. 

Tip: Electrode lifetimes may vary depending on temperature.  At higher temperatures the lifetime of the pH electrode will decrease.  This means you will need to replace the electrode more frequently if testing samples at high temperatures.

Don't forget to follow us on:

facebook    twitter    linkedin



Hanna Service d.o.o.

Ulica 15. Maja 19a

6000 Koper - Slovenija

Tel: +386 (0) 59029902/3

Fax: +386 (0) 59029898

VAT: SI92346669

Products Catalog

ikona catalog

Browse our products catalogue. Products for a variety of industries. The catalog is in english.

Sign up for the eNews

News, discounts and events. Novosti, ugodnosti in dogodki. Sign up for the eNews!