WaterCompass / Installation FM300 Installation Guide 4" - 8" (LC+ & FD-R) Updated November 4, 2025 Was this article helpful? Yes No Related in Installation. FM250 Installation Guide Introduction The FM250 has been crafted to deliver precise flow measurement on a compatible water meter, eliminating the need for FM350 Installation Guide Introduction The FM350 flow monitor has been crafted to deliver precise flow measurement on an accessible water supply line, eliminating FM350 Quick Start Guide This Quick Start Guide provides a brief overview of the key steps required to install and activate your FM350 flow FM250 Quick Start Guide This Quick Start Guide provides a brief overview of the key steps required to install and activate your FM250 flow