Dieselcraft - Model DEF-1 -Diesel Fuel Test Kit

Tests for: Contamination caused by accidental DEF exposure in diesel. Place the colored end down into the test tube. Add questionable liquid.
As little as 0.1% DEF will turn the strip green and the same 0.1% water will give the same reaction. At 1% DEF the strip will begin to turn BLUE in a few seconds.