Thornton M300 Transmitters

The METTLER TOLEDO THORNTON M300 series of process analytical instruments provide single-channel, multi-channel and multi-parameter models to measure conductivity/ resistivity, pH/ORP, dissolved oxygen, ozone and flowrate. Both 1/4 DIN and 1/2 DIN enclosures are available for especially convenient panel, wall and pipe mounting.


  • Large backlit 4-line display
  • Compact 1/4 DIN panel-mounting with NEMA 4X, IP65 panel seal
  • Robust 1/2 DIN wall-mounting with NEMA 4X, IP65 back cover
  • User-selectable dual-level password protection
  • On-line sensor diagnostics for pH
  • Internal PID control with relay or analog output
  • USB port for configuration and data acquisition
  • Direct sensor inputs for all parameters
  • Compatible with existing Thornton sensors
  • Plug-in terminal connectors for easy wiring
  • Universal AC/DC power supply
  • Multiple languages: English, French, German, Italian, Spanish
  • CE compliant, UL Listing pending for US and Canadian standards
Thornton M300 Multiparameter Meters