What does a transformer oil acidity test kit measure?

An acidity test kit measures the oil’s neutralization number or acid number, indicating the concentration of acidic compounds formed by oxidation. Some field kits use colorimetric methods for screening, while laboratory methods use titration for accurate mg KOH per g results. Rising acidity correlates with declining IFT, increased sludge tendency, and accelerated paper degradation. In practice, the kit supports quick decisions on whether oil treatment, reclamation, or more detailed lab testing is needed.