I just give a try to PTRF network monitor. On my actual monitoring (nagios based), i modify a snmp sensor storage to give me an accurate value of OID storage.
188.8.131.52.184.108.40.206.220.127.116.11 = "640898972"
To have the correcte storage in byte i have to multiply the result by 4069.
How can i achieve this in PRTG with custom sensor ?