pH solutions with a known value are called buffer solutions. They can be used to check the your meter and electrode. They also provide a reference against Hanna buffer solutions are prepared according to precise against NIST references to ensure To keep your pH electrode accurate and to prolong its life, it is important to select the right solution for your appropriate application. Hanna cleaning solutions are therefore specifically formulated to clean electrodes used for dedicated food groups. What's more, there's no need to measure and decant the solution before use. Hanna solutions come in individual 20ml sachets making them easy to carry and use wherever and whenever you need. Storage solution : HKNNK | Cleaning solution Food Processing Food Processing Cleaning solution Food Processing Cleaning solution Food Processing Cleaning solution