Hanna HI-96804 Refractometer for Inverted Sugar

Hanna HI-96804 Refractometer for Inverted Sugar

Hanna HI-7007L pH 7.01 Buffer Solution, 500 mL bottle

Hanna HI-7007L pH 7.01 Buffer Solution

Hanna HI-7004L pH 4.01 Buffer Solution

£37.92 £31.60
Availability: In stock
Hanna HI-7004L pH 4.01 Buffer Solution

Hanna HI-7004L pH 4.01 Buffer Solution, 500 mL bottle

Achieve accurate pH readings and check your meter and electrode is functioning correctly with Hanna buffer solutions. 


Hanna HI-7004L - pH 4.01 buffer solution, 500ml bottle

The pH 4.01 buffer is available in a 500ml bottle, one of the most commonly used buffer solutions. It is extremely stable and represents the mid-way point in the acid range of the pH scale - ideal for those requiring an accurate acid reading, particularly those working in water purification plants, the food industry, and wherever the pH is expected to be acidic.

Buffer solutions should be stored at 25◦C, away from direct sunlight for accurate readings.

To correctly maintain your meter/electrode, we highly recommend use of a Hanna cleaning solution, as well as a buffer, for maximum performance every time. pH4, along with pH7, can also be used as an emergency storage solution.

Hanna buffer solutions are prepared, ready-to-use, according to precise formulas and standardised in accordance with the National Institute of Standards and Technology (NIST) to ensure quality and accuracy. All solutions show a batch number, an expiry date, and the correlation table between pH and temperature. A certificate of analysis is available on request. All bottled solutions are sealed with an air tight, tamper-proof seal to prevent any Carbon Dioxide from entering and causing a change in the pH buffer value.


  • Calibration only counts when using fresh solutions and properly cleaned electrodes every time.
  • Routine maintenance will ensure accurate readings while extending the life of the electrode.

Useful information:

  • pH 4.01 - Red
  • pH 7.01 - Green
  • pH 10.01 – Violet

All calibration buffers are made to a premium quality, produced in accordance with ISO 3696/BS3978 standards using high purity salts, deionised water, certified weight-checked balances, and Class A glassware in a temperature-controlled environment monitored with certified thermometers.



Standard ±0.01 pH

pH Value @25°C








Certificate of Analysis



Contact us if you require any assistance with your choice of any Hanna Instruments or accessories.


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