Flourescent Penetrant MET-L-CHEK FP-93A (M) – Sensitivity 2 – a medium sensitivity penetrant suitable for use in general metal working inspection. Approved for use in aircraft industry by Boeing BSS 7039 & BAC 20-20-0, Pratt & Whitney FPM PMC #4353-AG, General Electric Aircraft Engines 70-32-02 & Gas Turbines LM6000 PC 11, Rolls-Royce RPS-702-7. Used with either lipophilic E-57 (Method B) or hydrophilic E-58D (Method D) emulsifiers.