pH test strips and papers are a quick and simple option. They come in the form of single use strips or reels that change colour to indicate the pH. The simplest type of pH test paper would be litmus paper, simply indicating if your test sample is acidic or alkaline. If you would like to read more on the differences between pH paper reels and test strips, you can check out our blog post here.
pH indicator solution will exhibit a colour change depending on the pH of the sample they are being used to test. Indicator solution can be useful in testing solids for exmple soil.
Reagents are added to your sample where a colour change is exhibited. This is then compared to a chart or a colour wheel standard by eye to give the pH result. These are often limited to only being suited for clear liquids. An example would be a comparator.
Photometers and colorimeters
Photometers and colorimeters build on the colour test kits. Reagents are added to your sample exhibiting a colour change however this is evaluated by an electronic machine giving you read out of the result. These are often limited to only being suited for clear liquids.
Electrochemistry pH meters work using a pH electrode which measures the H+ concentration in your sample. The electrode is connected to a meter which gives you the result usually as a digital display and can have accuracy as high as 0.001 pH.