The CORRinSITE is a corrosion monitor manufactured from the same mild carbon steel as the system's piping so its surface corrodes at the same rate as the pipe. When the monitor corrodes beyond its limit, moisture penetrates the sealed chamber and transforms the brilliant white sight glass to a fluorescent orange color indicating a corrosion problem and a need for further pipe inspection. The CORRinSITE Model 7700 inline pipe corrosion monitor is suitable for new construction and can be retrofitted into existing fire protection systems.