Methods : ASTM D1655, DEF STAN 91-091, ASTM D8073, IP 624, JIG Bulletin 150 The WSI is a fully automated, portable bench-top device that measures how effectively fuel releases entrained and emulsified water through a coalescing filter. With a user-friendly touchscreen, minimal training requirements, and automated test sequences, WSI delivers repeatable results while reducing labour and maintenance costs. Data storage, easy USB export, and on-site calibration make it an efficient choice for water separation performance testing.