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Portable pH meters

Connect your lab and process with the Liquiline CML18 multiparameter handheld and Memosens Lab sensors

Portable pH meter with electrodes in a laboratory

No matter whether you want to capture and analyze pH, ORP, dissolved oxygen or conductivity values in the laboratory, reliable measuring instruments are needed. Endress+Hauser transfers the knowledge and technologies from process automation to laboratories. Benefit from our Memosens Lab portfolio with cutting-edge Memosens 2.0 technology offering easy operation, highest accuracy and reliable measured values.

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Laboratory products

Our product finder helps you to search for suitable measuring devices, software or system components via product characteristics. Applicator leads you through an individual product selection via application parameters.

The Memosens Lab portfolio bundles all components which are needed to ensure traceable and reliable measurements in the lab or for random sampling directly in the field. It consists of the Liquiline Mobile CML18 handheld, the Memobase Pro documentation software for perfect traceability and accurate lab sensors for pH , ORP, dissolved oxygen (DO) and conductivity . All instruments are connected and provide 100% consistent measured values.

Make it easy

Just connect the sensor for your measuring task to the CML18 multiparameter handheld and start capturing values. To switch between the different parameters pH, ORP, dissolved oxygen and conductivity, simply change the sensor directly on site and start measuring without any further calibration. All steps of your measurement are traceably documented in the Memobase Pro software to meet your GLP (Good Laboratory Practice) requirements.

Give me values I can trust

The sensors impress with a high accuracy and fast response time, which is indispensable especially for oxygen measurements. Memosens sensor technology also ensures a trouble-free measurements and a solid digital signal without the risk of sudden signal loss. The technology is unique in lab measurements and simplifies the daily work on all levels. Using one technology for all measurements in the lab and the process guarantees full consistency and reliable measured values at all times.

Check online measuring loops in the process

Use the Liquiline Mobile CML18 as portable pH meter, portable dissolved oxygen meter and portable conductivity meter to check your measuring points. Capture the measured values for pH, ORP, conductivity or oxygen in parallel to the online measurements.

Measurements directly in the field

Control of critical parameters right at the application location. For example, operators need to control the dissolved oxygen concentration in aeration tanks in wastewater treatment plants. With the Liquiline CML18 and the COL37E, you can rely on easy operation and accurate measurements.

Check your grab samples in the lab

Analyze samples from the process in the laboratory. With the Memobase software, all measured values can be documented traceably according to GLP.


  • Reliable measured values: We transfer our process knowledge to your lab measurement. Proven Memosens technology with true plug & play for all use cases from random sampling checking your existing measuring points.
  • Easy operation thanks to true plug & play: Just change the sensors right at the measuring point to capture other parameters. There is no further calibration needed.
  • Boost your GLP for full sensor and measurement traceability: With Memobase Pro Mobile, you can easily perform sensor adjustments and scan the QR code on Endress+Hauser buffer solutions for full traceability down to the buffer bottle series.
  • Liquiline CML18 portable meter for mobile measurements: The portable transmitter features Bluetooth connection and can be equipped with useful accessories such as a shock-resistant bumper or a lanyard for free hands while working.
  • Customize your portable pH meter: Select from 4 pH electrodes - Memosens CPL51E & Memosens CPL53E for standard applications, Memosens CPL57E for pure water and Memosens CPL59E for demanding media – and combine them with the Liquiline CML18 handheld.