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Mettler Toledo

METTLER TOLEDO is a leading global manufacturer of precision instruments and services for use in laboratories and manufacturing. Lab pH Instruments, pH and Conductivity Measuring Solutions for Laboratory and Field Applications Electrochemistry systems provide accurate measurements of pH, conductivity, ion concentration, ORP/redox and dissolved oxygen. Pair our meter with one of our high-quality sensors, calibration solutions, and analytical software to complete your measuring solution.

pH Applications and Electrodes

The electrode is the key to successful analysis. Since the electrode is the only part of the analytical instrument that is in direct contact with the sample, its selection and maintenance have the strongest influence on precise and accurate measurements. However, a pH electrode that has been correctly selected and that has been working properly may nevertheless suddenly start performing badly. Below are guides to help you chose the right electrode for each application.

Mettler Toledo™ pH Meter SevenDirect SD20

The Perfect InLab™ pH Electrode Handling

Electrodes are one of the most important parts of the any pH measuring system. In order to ensure you have the most accurate and precise results extra care need to be taken over the unpacking, storage, cleaning and maintenance. Below are some videos to guide you through this process.

Unpacking and Quality Check

Electrode Preparation Before Measurement

Measuring pH Correctly

pH Electrode Cleaning

Electrode Storage

Troubleshooting pH Electrode Issues

How to Measure pH and Conductivity in Quality Control, Pharmaceutical and Biological Applications

These application notes focus on best practices for measuring pH and conductivity across quality control, pharmaceutical, and biological workflows. Learn about industry-specific requirements and optimized measurement techniques to ensure accuracy, reliability, and compliance in your critical processes.

Application guide on measuring in TRIS

Filename
22667_ApplicationNote_pH_MeasurementBasicsTRISsamples_EN.pdf
Size
926 KB
Format
application/pdf

Application guide on measuring protein samples

Filename
22667_ApplicationNote_pH_MeasurementBasicsProteinSamples_EN (1).pdf
Size
608 KB
Format
application/pdf

Application guide on measuring on agar plates

Filename
pH_Measurement_Agar_Plates_EN_30625019.pdf
Size
774 KB
Format
application/pdf

Application guide on measuring pH in pharmaceutical suspensions

Filename
pH_Measurement_of_Suspensions_EN_LR.pdf
Size
986 KB
Format
application/pdf

Application guide on measuring pH of small volume samples

Filename
Conductivity_of_Small-Volume_Samples-EN-AN-B-PHL-20240606-00188830.pdf
Size
1 MB
Format
application/pdf

Application guide on measuring pH of small volume samples

Filename
pH_Measurement_of_Small-Volume_Samples_EN.pdf
Size
1 MB
Format
application/pdf

Application guide on measuring pH in liquid culture media

Filename
pH_AN_Measurement_Liquid_Culture_Media_EN.pdf
Size
760 KB
Format
application/pdf

How to Measure pH in Food

Measuring pH in food production provides essential insights into its quality, safety and consistency. Variability of pH in food production can lead to critical differences in taste, freshness and shelf-life of a final product, making the pH value one of the parameters most frequently measured during inspection before release. Yet pH is also influential during food preparation. For instance, enzymatic activity is strongly pH-dependent. Controlling pH also regulates the growth of desired and undesirable microorganisms alike.

Application note on measuring in yogurt

Filename
22667_ApplicationNote_pH_Measurement_Yogurt_EN.pdf
Size
973 KB
Format
application/pdf

Application guide on measuring in fruit and vegetables

Filename
22667_ApplicationNote_pH_Measurement_FruitVegetables_EN.pdf
Size
1 MB
Format
application/pdf

Application guide on measuring in meat

Filename
22667_ApplicationNote_pH_Measurement_Meat_EN.pdf
Size
992 KB
Format
application/pdf

Application note on measuring pH of cheese

Filename
pH_Measurement_Cheese_A4_EN.pdf
Size
305 KB
Format
application/pdf

Application note on measuring pH of jam and jellies

Filename
pH_Measurement_Jam_Jellies_A4_EN.pdf
Size
327 KB
Format
application/pdf

Application note on measuring pH of rice

Filename
pH_Measurement_Rice_A4_EN.pdf
Size
376 KB
Format
application/pdf

Application note on measuring pH of plant based proteins

Filename
pH_Measurement_of_Plant-Based_Protein-EN.pdf
Size
1 MB
Format
application/pdf

Application note on measuring pH of seafood

Filename
pH_Measurement_in_Seafood_A4_EN.pdf
Size
338 KB
Format
application/pdf

Application note on measuring of brine

Filename
pH_Measurement_of_Brine_A4_EN.pdf
Size
364 KB
Format
application/pdf
Fruit Juice

How to Measure pH in Beverages

The pH of beverage is important for its flavor, aroma, and safety. Beverages manufacturers must adhere to stringent guidelines set by regulatory agencies to ensure the consistency and quality of their products. pH measurements at different stages of beverages manufacturing help ensure the beverages meet regulatory standards. 

Application note on measuring in fruit juice

Filename
22667_ApplicationNote_pH_Measurement_FruitJuice_EN.pdf
Size
320 KB
Format
application/pdf

Application guide on measuring in milk

Filename
22667_ApplicationNote_pH_Measurement_Milk_EN.pdf
Size
318 KB
Format
application/pdf

Application guide on measuring in wine

Filename
22667_ApplicationNote_pH_Measurement_Wine_EN.pdf
Size
1 MB
Format
application/pdf

Application guide on measuring in beer

Filename
pH_Measurement_Beer_A4_EN.pdf
Size
278 KB
Format
application/pdf

Application guide on measuring in soft drinks

Filename
pH_Measurement_of_Soft_Drinks-EN.pdf
Size
774 KB
Format
application/pdf
Paint

How to Measure pH and Conductivity in Chemical Samples?

These application notes cover measuring pH and conductivity in various chemical samples, crucial in different industries.

Application guide on measuring pH in paints

Filename
pH_Measurement_of_Paints_Using_InLab_Sensors-EN.pdf
Size
1 MB
Format
application/pdf

Application guide on measuring pH and conductivity of CMP slurry

Filename
pH_Measurement_of_CMP_Slurry-EN.pdf
Size
981 KB
Format
application/pdf

Application guide on measuring conductivity of the electrolyte of Li-ion batteries

Filename
Conductivity_Measurement_Li-Ion_Batteries_EN.pdf
Size
901 KB
Format
application/pdf

Application guide on measuring pH of cathode materials

Filename
pH_AN_Measurement_of_Cathode_Materials_EN_LR.pdf
Size
836 KB
Format
application/pdf

Application guide on measuring pH of silver nitrate (raw material in producing PV solar cells)

Filename
pH_Measurement_of_Silver_Nitrate_EN_LR.pdf
Size
1 MB
Format
application/pdf

Application guide on measuring pH of e-Liquids

Filename
pH_Measurement_of_E-Liquids_EN.pdf
Size
864 KB
Format
application/pdf

Using Mettler Toledo pH Meters

pH meters come with a variety of settings and applications, along with the need to calibrate on a regular basis. This page can guide you through this process along with any additional needs like installation and PC connections.

Mettler Toledo™ pH Meter SevenDirect SD20

SevenDirect Meters

SevenDirect™ Benchtop Meters by METTLER TOLEDO. Developed for a wide range of applications, SevenDirect benchtop meters provide accurate pH, ion concentration, and conductivity measurements of almost any sample. They are easy to use, with data handling options and robustness that will delight discerning users.

SevenDirect™ How-to (1/6): pH Meter Installation and Setup

SevenDirect™ How-to (2/6): Basic pH Meter Operation

SevenDirect™ How-to (3/6): pH Verification Process

SevenDirect™ How-to (4/6): EasyDirect pH Software

SevenDirect™ How-to (5/6): Efficient pH Calibration

SevenDirect™ How-to (6/6): Accurate pH Measurements

FiveEasy pH Meters

With a compact design and intuitive operation, the FiveEasy benchtop meter from METTLER TOLEDO offers quality measurement for the budget-minded. These how-to videos will walk you through the step-by-step process of unboxing and setting up your FiveEasy meter for the first time. With intuitive operation, the FiveEasy is ready to perform measurements quickly. Use this step-by-step guide to simplify the process even further!

FiveEasy How-To (1/3): pH Meter Installation and Setup

FiveEasy How-To (2/3): pH Calibration

FiveEasy How-To (3/3): pH Measurement and Maintenance

Buffers and solutions

Buffers and Solutions

Watch this video and learn how to perform effective pH and conductivity calibrations with single-use sachets by METTLER TOLEDO.

Single-Use Sachets: Effective pH & Conductivity Calibration

Using Mettler Toledo Density meters and Refracto meters

Using Mettler Toledo Density Meters and Refractometers

Made for use in the lab and on-the-go, Mettler Toledo Density and Refractometers are perfect for all kinds of applications, from quality control of incoming goods to at-line quality assurance. Discover the versatility of our Density2Go handheld density meters and MyBrix handheld refractometer with in-depth information, including usage videos.

Mettler Toledo™ Handheld Density Meter
Top Down Densito

Density2Go Meters

Designed to fit comfortably in a single hand, the lightweight Densito portable density meter allows for one-handed operation in the lab or on-the-go. Results are temperature-compensated and can be delivered in specific gravity, Brix, API units, and other formats.

Density2Go - Unboxing

Density2Go - How To Use

Density2Go - How To Measure

Density2Go - How To Clean

Density2Go - How To Calibrate

Density2Go - How To Measure Viscous Samples

Density2Go - How To Export Data to EasyDirect

Density2Go - How to Print (Bluetooth Printer)

Density2Go - How to Print (USB Printer)

MyBrix refractometer

MyBrix Refractometer

Made for use in the lab and on-the-go and designed with a full Brix range (0.0 to 95.0 °Brix), the MyBrix refractometer works perfectly for measuring almost any food and beverage sample. Ideal for determining the optimal harvesting time of fruits and vegetables, performing incoming goods inspection, or process and quality control in juice, wine, soft drinks and food manufacturing.

MyBrix - Unboxing

MyBrix - Calibrating MyBrix Pocket Refractometer

MyBrix - Entering MyBrix Pocket Refractometer's Menu and Changing Scales

MyBrix - Measuring with MyBrix Pocket Refractometer

MyBrix - Cleaning MyBrix Pocket Refractometer

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Promotions Available

Mettler Toledo™ Self-Adhesive Paper Rolls for Mettler Toledo Balance Printers

For use with Mettler Toledo LC-P43 Printer, BT-P42 (wireless) Printer, and RS-P42 Printers. Mettler Toledo™ Self-Adhesive Paper Rolls for Mettler Toledo Balance Printers are replacement adhesive papers.

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2
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Mettler Toledo™ Balance Printer Accessories: Printer Paper

Printer paper for use with Mettler Toledo™ balances.

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3
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Mettler Toledo™ Buffer Solutions: Standard pH
GREENER_CHOICE

Storage and refill solutions for pH electrodes

EDGE
Includes Quality inspection certificate
Boiling Point ∼100°C
Type Buffer Solution
Water Soluble Completely Miscible
Filling Solution Type pH Buffer
4
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Mettler Toledo™ Ribbon Ink Cartridge

For use with Mettler Toledo pH meters and printers.

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5
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Mettler Toledo™ KCl 3M Electrode Filling Solution

Equipped with a special cap to facilitate easy filling of electrodes. Mettler Toledo™ KCl 3M Electrode Filling Solution is an electrolyte solution that enables optimum performance of pH and ion-selective electrodes. This bridge electrolyte contains no silver ions than can contaminate samples.

EDGE
pH Range Neutral
For Use With (Equipment) ARGENTHAL™ Reference System pH Electrodes, DX Series ISE Half Cells
Color Colorless
Packaging Bottle with Special Filling Cap
Concentration 3 mol/L KCl
NIST Traceable Yes
6
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Technical pH Buffer Solutions, METTLER TOLEDO™
GREENER_CHOICE

Provides a reliable all-around pH buffer. Mettler Toledo™ Technical pH Buffer Solution are specified to two decimal places and are traceable to NIST standards. Color-coded solution comes in a handy 250mL plastic bottle with no-fuss labels.

EDGE
For Use With (Equipment) pH Electrode
Traceability to NIST Yes
Quantity 250 mL
Grade Technical
For Use With (Application) pH measurement, electrode calibration
7
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Technical Buffer Solution pH 7.00, Mettler Toledo™
GREENER_CHOICE

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8
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pH Buffer Sachets, METTLER TOLEDO™
GREENER_CHOICE

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9
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METTLER TOLEDO™ InLab™ Expert pH Electrodes

A combination pH electrode with PEEK plastic shaft for chemical and mechanical durability, and a fixed cable. Designed for use in a variety of applications.

EDGE
Diameter (English) 0.47 in.
Length (Metric) 120 mm
pH Range 0 to 14
Diameter (Metric) 12 mm
Membrane U Glass
Filling Solution Type Xerolyt Polymer
Material PEEK
Temperature (Metric) Operating 0°C to 100°C
Internal Reference ARGENTHAL
10
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Conductivity Standards for METTLER TOLEDO Conductivity Probes, METTLER TOLEDO™
GREENER_CHOICE

Recommended NIST traceable solutions for calibrating or verifying METTLER TOLEDO conductivity electrodes.

EDGE
Type Conductivity Standard
For Use With (Equipment) Conductivity Electrodes
Recommended Storage Ambient
Solution Type Conductivity Standard
11
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Mettler Toledo™ LE pH Electrode LE438-IP67 pH/Conductivity/DO Meter

IP67 waterproof, plastic pH electrode with integrated temperature sensor.

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12
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Technical Buffer Solution pH 4.01, Mettler Toledo™
GREENER_CHOICE

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13
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Technical Buffer pH 9.21 Sachets, Mettler Toledo™
GREENER_CHOICE

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14
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METTLER TOLEDO™ Micro pH Electrodes

pH electrodes designed for small sample volumes or for measuring in small containers.

EDGE
Type Combination Electrode
Response Time <20 sec.
15
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Conductivity Standards, 84μS/cm, Mettler Toledo™

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Resources

Brochure InLabSensors

The manufacturing of high quality sensors with outstanding performance not only requires technical skills and expertise but also a profound understanding of the various customer applications and their specific requirements. METTLER TOLEDO has built up an enormous treasure trove of experience and knowledge over the last decades, which has resulted in a complete sensor portfolio that supports any of your applications.

Download
Brochure InLabSensors

Electrochemistry Buffer and Standards

The determination of pH, conductivity, ion concentration, redox potential and dissolved oxygen are common analyses in most laboratories. The measurement accuracy highly depends on the quality and handling of the solutions used for sensor calibration and maintenance. METTLER TOLEDO takes pride in a long tradition of producing complete measurement systems, including a comprehensive range of top quality solutions.

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Electrochemistry Buffer and Standards

The 7 Most Asked Questions About pH

Accurate pH measurement is essential in various laboratory applications. The "7 Most Asked Questions About pH" guide addresses common inquiries, including calibration frequency, assessing calibration curve quality, electrode lifespan, troubleshooting unstable readings, proper electrode storage, selecting appropriate reference electrolytes, and effective electrode cleaning methods. This resource provides practical advice to ensure precise and reliable pH measurements.

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The 7 Most Asked Questions About pH

Buffers and Solutions Expert Tips

Master the art of standard handling with METTLER TOLEDO's expert tips - the motto of our buffers and solutions flyer. This collateral is packed with crucial insights into why proper buffer management matters, the challenges it presents, and how adhering to Best Practices can make all the difference in achieving accurate pH levels in your experiments.

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Buffers and Solutions Expert Tips

pH Electrode Maintenance Guide

Your Go-to Guide for Easy pH Electrode Handling and Maintenance. By following simple practices—such as thorough cleaning, maintaining electrolyte levels, ensuring the correct sensor position, and performing regular calibration—you can significantly enhance the quality of your results. Our poster features easy-to-understand visuals that clarify these concepts even further. 

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pH Electrode Maintenance Guide

pH Calibration Guide

Guideline to Calibrate pH Electrodes to Ensure Good pH Measurement Results. pH calibration is the key to successful pH analysis. This document provides guidance on: Preparation of the calibration buffer, Calibration of your electrode, Evaluation of the calibration results. Learn how to perform a proper pH calibration in a clear, easy and defined way, and assure the reliability and quality of your pH measurements.

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pH Calibration Guide

Buffers and Solutions Brochure

The determination of pH, conductivity, ion concentration, redox potential and dissolved oxygen are common analyses in most laboratories. The measurement accuracy highly depends on the quality and handling of the solutions used for sensor calibration and maintenance. METTLER TOLEDO takes pride in a long tradition of producing complete measurement systems, including a comprehensive range of top quality solutions.

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Brochure InLabSensors

Brochure Density2Go

A handheld density meter is a portable device designed to measure the density of liquids in various industries, such as pharmaceuticals, food and beverages, chemicals, and more. Densito and DensitoPro by METTLER TOLEDO are two handheld density meters that offer convenience for both laboratory use and on-the-go measurements. They provide clear, step-by-step instructions to make measuring and cleaning easy, ensuring quality control from incoming goods to final products.

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Density 2Go

From Analog to Digital Handheld Refractometers

Manual methods are being replaced by digital refractometers for many reasons. Even though digital refractometers are slightly more expensive, it is a necessary investment. Some key advantages of automatic refractive index measurements include time saving, higher accuracy and repeatability, and operator independent results.

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From Analog to Digital Handheld Refractometers

Guide - 3 Ways to Measure Density Using Hydrometers, Pycnometers and Digital Hydrometers

This guide covers these three ways to measure density to help you decide which method is the best for your products and processes, including the following topics:

  • How to choose your hydrometer, pycnometer, or digital hydrometer
  • How to use your instrument
  • Calibration of your instrument
  • Tips and hints
  • Relevant standards and norms
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Guide - 3 ways to measure density using hydrometers, pycnometers and digital hydrometers