Formulated for use on POE's as well as mineral oils and alkylbenzene. A disposable test kit that provides proof-positive that acid level in refrigeration oil is safe or unsafe. Phase separation makes it easy to see change in color of acid indicator (even if a leak detection dye has been added to the oil). Just two bottles to work with. It is a simple, safe, accurate and small enough so you can carry several in your tool box.