Food industry workers must not only use the proper, federally approved sanitizing agents, they must use these sanitizers at proper concentrations and strengths. The only way to determine this is through routine testing with precise, accurate testing products. Micro Essential Laboratory, a trusted worldwide leader in test kits since 1934, offers a variety of sanitizer test kits for chlorine, iodine and quaternary ammonium compounds. Our Hydrion Sanitizer Test Kits , Chlorine Test Kits , Quaternary Tests, and Iodine Tests , all measure effective sanitizer levels and ensure food safety as required by Federal, State, and Local Health departments.
Litmus paper will most certainly continue to be used extensively in education due to its reasonable cost and ease of use. However, some varieties of lichens are becoming extinct. As a result, it is possible that manufacturers of litmus paper may switch to synthetic materials in the future. This is already being done by manufacturers of other types of pH papers. Additionally, because litmus cannot give quantitative results, it cannot replace other pH papers and pH meters. In fact, the trend is to make pH indicators that are even more accurate and less subjective. One such trend is to utilize fiber optic probes in pH meters in order to make them even more sensitive.
When to connect the dots? If each point in the series is obtained from the same source and is dependent on the previous values (. a plot of a baby's weight over the course of a year, or of muscle strength on successive contractions as a muscle fatigues), then the points should be connected by a line in a dot-to-dot fashion. If, however, the series represents independent measurements of a variable to show a trend (. mean price of computer memory over time; a standard curve of optical density vs. solute concentration), then the trend or relationship can be modeled by calculating the best-fit line or curve by regression analysis ( see A Painless Guide to Statistics ) Do not connect the dots when the measurements were made independently.