vaf77Through education we have to lead people to see that concern for others is actually in their own interest. ١٨٨. ٦ آلاف. ١ ألف. Vladimir Fedotov · @VAF77.Introducing the VAF Instruments 771 Electronic Fuel Viscosity Controller, an essential component of the ViscoSense®, ViscoSense® 2, and Viscotherm® systems.