ECHO Process Instrumentation Inc. sells the most advanced ultrasonic level, pump controller, clamp-on flowmeters and open channel flowmeters available. The Arrow Hunter Plus series of Transit-time clamp-on flowmeters will measure any clean or dirty liquid up to 118" diameter pipes with or without liners. The ECHO Flow Hunter is extremely accurate for all Flumes and Weirs. The standard housing is HDPE with optional PTFE and PVDF for corrosive environments. We offer 60 day Performance Guarantees on all applications. We also sell submersible pressure transducers, capacitance and ultrasonic gap level switches, and non-intrusive liquid flow/no flow switches.