By placing a drop of fluid on the kit's test pad, and comparing the results to the provided ISO diagnostic chart, a technician can visuallydemonstrate the need for service to his customers. The instant lubricant diagnostic kit provides proof positive that a depleted fluid needs to be flushed or changed. Sell more services with this show and tell sales aid. New:This sample is light in colour and is absorbed by the test medium very quickly. Good:The sample is slightly darker that new and absorbs Change:The sample has become darker due to normal degradation and the presence of wear debris. Although this fluid will provide some protection the degradation process will become much faster. Bad: Simple has gone beyond its useful service life and needs to be changed immediately. Making sure your fluids never get to this stage will save many dollars in needless repairs and extend the service life.