The Mettler Toledo M300 Pure Waters Transmitters provide four-wire, single- or dual-channel measurement capabilities for pure and ultrapure water systems.
The family is available in ¼ DIN and ½ DIN configurations to support different panel, wall, and pipe-mounting requirements.
Depending on the selected model and connected sensor, the M300 Water family supports parameters including pH/ORP, pH/pNa, conductivity, resistivity, and dissolved ozone.

M300 Water transmitters are intended primarily for pharmaceutical water systems, power plant water and steam cycles, and semiconductor ultrapure water applications.
Key Characteristics
- Four-wire transmitter platform available in single- and dual-channel configurations
- ¼ DIN and ½ DIN enclosure options for different installation requirements
- Touchscreen interface for viewing measurements, sensor information, diagnostics, and configuration settings
- Model-dependent compatibility with analog sensors and digital ISM sensors
- Supports pure water parameters including pH/ORP, pH/pNa, conductivity, resistivity, and dissolved ozone
- USB connectivity for transferring configurations, measurement information, and history
- Access to ISM diagnostic functions when integrated with compatible digital ISM sensors
Ideal Applications
- Pure and ultrapure water monitoring
- Pharmaceutical water systems
- Power plant water and steam cycle monitoring
- Semiconductor ultrapure water systems
- Conductivity and resistivity measurement
- Multi-parameter water analytics
Product Family Includes
- Transmitter M300 Water 1-CH ¼ DIN
- Transmitter M300 Water 1-CH ½ DIN
- Transmitter M300 Water C/R 2-CH ½ DIN



