The Mettler Toledo M300 Water 1-CH ½ DIN (4-Wire) is a single-channel, multi-parameter transmitter designed for in-line pure water measurement.
It connects with compatible analog or digital ISM sensors to display and manage pH, ORP, conductivity, dissolved oxygen, or dissolved ozone measurements from one monitoring point.
Its ½ DIN format combines a black-and-white touchscreen interface with configurable outputs and USB connectivity for setup and measurement-data capture.

The transmitter can be incorporated into water monitoring and control systems used across pharmaceutical, power generation, semiconductor, and other high-purity water applications.
Key Characteristics
- Single-channel, ½ DIN transmitter with four-wire installation
- Supports pH, ORP, conductivity, dissolved oxygen, and dissolved ozone measurement
- Compatible with supported analog and digital ISM sensors
- 4.0-inch black-and-white TFT touchscreen with four soft keys
- USB connectivity for transmitter setup and measurement-data capture
- Configurable analog outputs, relays, digital input, and PID control
Ideal Applications
- Monitoring pH, ORP, conductivity, dissolved oxygen, or dissolved ozone in pure water systems
- Pharmaceutical pure-water monitoring, including USP and WFI water applications
- Power plant water and steam-cycle chemistry monitoring
- Semiconductor ultrapure water systems
- Single-point water analytics requiring a ½ DIN transmitter format
Parameters
- Conductivity
- Dissolved Oxygen
- Dissolved Ozone
- ORP
- pH
Communication
- None
Product Family Includes
- M300 Water 1-CH ¼ DIN (4-Wire)
- M300 Water 1-CH ½ DIN (4-Wire)
- M300 WaterC/R 2-CH ½ DIN (4-Wire)
Industries Served
- Chemical Processes
- Other Industrial Processes
- Other Water Processes
- Pharmaceutical Waters
- Power Plant Water/Steam
- Semiconductor Water
- Wastewater







