Automatic Closed Cup Flash Point Testers find the lowest temperature at which vapor from a liquid ignites. The sample heats in a sealed cup, and a shutter opens at set intervals to expose an ignition source. A closed cup traps vapor, so results are lower and more repeatable than open cup tests. This makes the method the usual choice for fuels and solvents. Test ranges run from room temperature to 350 degrees C. Models with a built-in compressor chill the sample to minus 40 degrees C for low flash materials. Electronic ignition and PT100 sensing give repeatability within 2 degrees C. Typical uses include diesel, jet fuel and biodiesel QC, plus solvent and paint safety classification.