When I run a "Scan OIDLIB" in SNMP Tester (v5b11), I get the proper value for a specific OID as "-69", which is a dB measurement. When I use the OID in PRTG, I get an enormous value of "4294967226".
In the MIB Importer (v3.4.6a), it lists the OID as:
Source: Kind: Table Type: Gauge Unsigned (not checked) 64bit (not checked) float (not checked)
Value: Unit: Custom # Scale: 1 (divide)