> WP POCKET TESTERS
::pH55 - Pocket-size pH / Temperature Meter with replaceable electrode
::pH56 - Pocket-size pH / Temperature Meter with replaceable electrode
::EC59 - Pocket-size Conductivity / TDS / Temperature Meter with replaceable electrode
::EC60 - Pocket-size Conductivity / TDS / Temperature Meter with replaceable electrode

> POCKET TESTERS
::pH600 - pH Economical Pocket Tester
::CD611 - Conductivity Economical Pocket Tester

> PROFESSIONAL PHOTOMETERS
::Mi412 - Phosphate (Low Range) Professional Photometer

> HANDY PHOTOMETERS
::MW12 - Phosphate handy photometer

> DIGITAL REFRACTOMETERS
::MA887 - Digital Refractometer for Seawater Measurements