The Dieselcraft DEF Test is designed to test for water and DEF in all diesel fuel. The test is a pass or fail test with results in less than one minute. The kit contains one test tube, 10 test stripes, and one transfer pipette. Simply remove one test strip from the package, place the colored end down into the test tube, and add questionable liquid. The DEF will turn blue in a few seconds, the company says.
