A micro-leak detector to check package integrity on the line. Checks to ensure that packages are unbroken are carried out directly on the line by means of the use of Helium as a tracing gas and vacuum pump units.This wholly automatic system comprises the feeding conveyor, the inspection unit and the outlet conveyor with detecting expulsion. The electronics include 100 product formulas for setting the various functioning parameters. SNIFFER® systems can be fully combined with Prisma weight checkers and metal detectors.