Does an unbalanced stirrer on a jar tester affect the results?
Unbalanced stirrer on a jar tester
Although it is preferable that the stirrers rotate in balanced fashion, some unbalanced stirring will not affect the results. The mixing energy and mixing time are most important. Mixing energy is related to the speed, shape of the paddles, and shape of the jar. If the results are in doubt, one could test for variation by running multiple tests with all beakers dosed the same and compare the results.