A device that passively monitors arriving and departing data packets on one or more networks, correlates arriving data packets with departing data packets, and calculates a latency estimate based on the confidence of the correlation. The product dispenser may include at least one macro-ingredient source, at least one micro-ingredient source positioned about the dispenser, a diluent source, a dispensing valve, a number of pumps or metering devices, and a user interface. The method may further include enforcing the selected policy relative to access to the service by the consumer. If different nucleic acids are to be selectively purified from a single medium, multiple binding matrices, each compatible with a different nucleic acid, can be used. Each chute rail is provided with a hook mounted on each chute rail proximate the second end of the chute assembly and a bracket assembly mounted on each chute rail proximate the first end of the chute assembly.