Petroleum Software Limited (PSL) specialises in manufacturing in-line and non-radioactive multiphase metering systems (MPFM). PSL’s flagship product is named esmerMPFM. esmerMPFM comprises a non-intrusive spool fitted with standard transmitters and an Exd Flow Computer. esmerMPFM software is founded on fluid dynamic and thermodynamic models which can be tuned to specific process conditions by the end user. esmerMPFM systems have been implemented widely since 2004. Performance of the system has been evaluated in independent flow loop tests and by the operators. PSL is displaying the new low cost esmerGL, the classic esmerMPFM and esmerWiFi (remote MPFM) at the ADIPEC exhibition 11-14 November 2019.