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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.

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Related Resources

Mettler Toledo Theory Guide for pH

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Labcon Eclipse Pipette Tips

Mettler Toledo Guide for Conductivity

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Labcon Eclipse Pipette Tips

Mettler Toledo Guide for Ion Selective Electrodes (ISE)

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Labcon Eclipse Pipette Tips

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 in Samples Containing TRIS and Biological Samples

TRIS buffers, which are often present in biological samples can cause challenges in pH measurement. The interaction between classic electrolyte solutions and the key components of the TRIS base leads to junction blockage and shortened sensor lifespan. Selection of the appropriate reference system can allow improved sensor accuracy and extended lifetime. Measuring pH in protein-containing samples can be challenging as protein can foul both the pH sensing glass and classical ceramic junctions. In order to obtain accurate pH readings, both of those components must be maintained in optimal condition.

Application note on measuring in TRIS
Filename
22667_ApplicationNote_pH_MeasurementBasicsTRISsamples_EN.pdf
Size
926 KB
Format
application/pdf
Application note on measuring on Agar Plates
Filename
22667_ApplicationNote_pH_Measurement_Agar_Plates_EN.pdf
Size
774 KB
Format
application/pdf
Application note on measuring protein samples
Filename
22667_ApplicationNote_pH_MeasurementBasicsProteinSamples_EN.pdf
Size
608 KB
Format
application/pdf

How to Measure PH in Food and Drink Samples

Food and drinks are a crucial part of everyday life. In order to ensure the maximum safety and regulatory requirements correct testing is paramount. Here are a number of application guides for food and drink samples that each require a specific electrode or method to measure accurately and precisely.

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 Wine
Filename
22667_ApplicationNote_pH_Measurement_Wine_EN.pdf
Size
1 MB
Format
application/pdf
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 & Vegetables
Filename
22667_ApplicationNote_pH_Measurement_FruitVegetables_EN.pdf
Size
1 MB
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 Meat
Filename
22667_ApplicationNote_pH_Measurement_Meat_EN.pdf
Size
992 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

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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.

EDGE
2

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
3

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
4
Promotions Available

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
5

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
6
Promotions Available

Conductivity Standards, 84μS/cm, Mettler Toledo™

EDGE
7

Mettler Toledo™ Micro pH Electrode: LE422

Designed for measuring in small or narrow neck vessels or test tubes

EDGE
8

Mettler Toledo™ Redox Buffer Solutions

Storage and refill solutions for redox electrodes.

EDGE
Includes Quality inspection certificate
Type Buffer Solution
Water Soluble Completely Miscible
9

Mettler Toledo™ InLab™ Sensor Cables: S7 Connection

Electrode cables to connect Mettler Toledo InLab sensors to any Mettler Toledo meter.

EDGE
For Use With (Equipment) Mettler Toledo InLab Sensors
For Use With (Application) To connect Mettler Toledo InLab sensors to any meter
10

Mettler Toledo™ LE pH Electrode LE438-IP67 pH/Conductivity/DO Meter

IP67 waterproof, plastic pH electrode with integrated temperature sensor.

EDGE
11
Promotions Available

Buffer Solution, pH 10, Mettler Toledo™
GREENER_CHOICE

EDGE
12

METTLER TOLEDO™ InLab™ Routine pH Electrodes

A combination pH electrode with an integrated temperature sensor and chemically resistant HA glass body. It is designed for general lab applications and ideal for use at high pH values (IP67 rated).

EDGE
Type Combination Electrode
Temperature (Metric) Range 0°C to 100°C
pH Range 0 to 14
Membrane HA Glass
Material Glass
Junction Ceramic
Temperature (Metric) Operating 0°C to 100°C
13
Promotions Available

Technical Buffer for pH DKD Certified pH 4.01, Mettler Toledo™
GREENER_CHOICE

EDGE
14

Mettler Toledo™ Thiourea Cleaning Solution

Removes silver sulfide contamination from pH electrodes. Mettler Toledo™ Thiourea Cleaning Solution helps maintain electrode performance and should be utilized after measurements and prior to recalibration. Treatment should be applied until discoloration.

EDGE
15

METTLER TOLEDO™ InLab™ Science pH Electrodes

A pH electrode featuring a special glass body which is resistant to corrosive or organic samples, and is ideal for high temperatures and biological media. The high electrolyte outflow prevents contaminants from entering and clogging the junction, which would interfere with the reading.

EDGE
Diameter (English) 0.47 in.
Temperature (Metric) Range 0°C to 100°C
Temperature (English) Operating 32°F to 212°F
pH Range 0 to 12
Diameter (Metric) 12 mm
Membrane A41 Glass
Filling Solution Type 3mol/L KCl
Material Glass
Junction Moveable Glass Sleeve
Temperature (Metric) Operating 0°C to 100°C
Internal Reference ARGENTHAL with Ag+ trap

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.

Download
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