Level Meters LevelMaster™ CHS1000 Liquid Level Meter The EPG LevelMaster CH1000 Liquid Level Meter, a component of the EPG LevelMaster Level Measuring System, is used to monitor levels and control equipment. Operator Control Station (OCS) The Operator Control Station (OCS) is capable of multiple functions in a cost effective and familiar design. Features include interfacing with multiple sensors, annunciating multiple alarm conditions, and the use of a variety of input and output options. LMSA Level Monitoring Stand Alone System The LevelMaster Stand Alone (LMSA) Level Monitoring System monitors and displays liquid levels in sideslope risers, wells, tanks, sumps, reservoirs, and settling ponds. WNSA 1000 Tank Gauging System The EPG WNSA 1000 Tank Gauging System simultaneously measures and displays liquid level (feet) and volume (gallons) in horizontal and vertical cylindrical tanks.