PRTG defines a "sensor" as a single monitoring metric.
Beyond the strict sensor count, Paessler imposes operational rules on its free tier. No Multi-Server Scaling
Unlike "trial" versions that expire, the Freeware version is permanent but lacks several enterprise features.
Packet sniffing sensors look at high-volume data types but count heavily toward your 100-sensor cap.
★★★★☆ (4/5) for the software, ★★☆☆☆ (2/5) for the free tier's scalability
The most significant limitation is .
This is where the user experience can feel slightly deceptive to newcomers.
