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pH Meters

Top-Quality pH Meters and Electrodes for Your Lab

Get accurate and reliable pH measurements with MIDSCI’s premium selection of pH meters and electrode supplies. Start with our AquaSearcher™ pH Meters, designed for precision and ease of use in a variety of lab applications. These advanced meters deliver dependable performance for research, testing, and quality control environments.

Explore other options like the Jenway 3510 pH Meter, ideal for routine analysis with pH, mV, and temperature readings. Need portability? The Enterprise 350 pH Meter is a great general-purpose choice for on-the-go measurements.

Ensure accuracy and efficiency in your lab with MIDSCI™ pH meters.

Contact our Lab Consultants to find the best pH meter for your application, and sign up for our newsletter to keep up with new offers and promotions.

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AquaSearcher™ AB41PH Bench Meter

 

An advanced, research-grade benchtop pH meter offering accurate, repeatable results.


The OHAUS AquaSearcher™ AB41PH bench meter is designed with reliable measurement and precise performance in mind. The i-Steward ensures repeatable and consistent measurement accuracy for optimal peace of mind and can assist with compliance with 21 CFR Part 11 regulations.

Main Attributes 

  • Applications
    • pH, oxidation-reduction potential (ORP) with Temperature Measurements
  • Display
    • 6.5 In. Segment & Dot matrix LCD with backlight
  • Operation
    • Capacitive touch, ABS top housing, standalone electrode holder
  • Communication
    • RS232, USB Device (included), GLP/GMP data output with real-time clock
  • Construction
    • AC adapter (included)
  • Design Features
    • i-Steward, 3 endpoint modes, calibration due alarm, 1,000 measurement memory, ten most recent calibrations, password management


Item#:
ASAB41PHAQSRCH


AquaSearcher™ AB33PH Bench Meter

 

Highly reliable and user-friendly pH benchtop meter for standard laboratory applications.

 

The next step in the evolution of OHAUS’ original Starter Series, the all-new AquaSearcher™ AB33PH bench meter is designed to be reliable, efficient, and user-friendly. The i-Steward ensures repeatable and consistent measurement accuracy for optimal peace of mind. The large LCD display and touch keypad make changing the parameters, executing setup, and performing calibration as simple as using a smartphone.

Main Attributes 

  • Applications
    • pH, oxidation-reduction potential (ORP) with Temperature Measurements
  • Display
    • 6.5 In. Segment & Dot matrix LCD with backlight
  • Operation
    • Capacitive touch, ABS top housing, standalone electrode holder
  • Communication
    • RS232, USB Device (included)
  • Construction
    • AC adapter (included)
  • Design Features
    • i-Steward, Calibration due alarm, 1,000 measurement memory


Item#:
ASAB33PHAQSRCH


AquaSearcher™ AB33M1 Bench Meter

 

Easy-to-use and accurate multi-parameter benchtop meter.

 

The AquaSearcher™ AB33M1 multi-parameter bench meter is designed with reliable measurement and user interface in mind. The i-Steward ensures repeatable and consistent measurement accuracy for optimal peace of mind. The 6.5 In. LCD display and touch keypad make changing the parameters, executing setup, and performing calibration as simple as using a smartphone.

Main Attributes 

  • Applications
    • pH, Oxidation-Reduction Potential (ORP), Conductivity, Total Dissolved Solids (TDS), Salinity, and Resistivity with Temperature Measurements
  • Display
    • 6.5 In. Segment & Dot matrix LCD with backlight
  • Operation
    • Capacitive touch, ABS top housing, standalone electrode holder
  • Communication
    • RS232, USB Device (included)
  • Construction
    • AC adapter (included)
  • Design Features
    • i-Steward, Two Independent Channels, Calibration due alarm, 1,000 measurement memory


Item#:
ASAB33M1AQSRCH


AquaSearcher™ AB23PH Bench Meter

Designed with a large LCD Display and six instructional menu buttons, AB23PH is a simple pH meter. Auto buffer recognition and 3-point calibration capability ensure a reliable calibration result. Stand-alone holder increases the flexibility for routine experiments, and makes AB23PH a perfect space-saving bench meter for your lab. A 99-item memory for pH measurements ensures efficient data documentation.

Main Attributes 

  • Applications
    • pH, oxidation-reduction potential (ORP) with Temperature Measurements
  • Display
    • 5 inch segment LCD with backlight
  • Operation
    • AC adapter (included)
  • Communication
    • N/A
  • Construction
    • ABS housing, mechanical keys, built-in electrode holder
  • Design Features
    • Auto buffer recognition, two-point calibration, electrode condition icon  

Includes

  • Power Cord
  • AB23PH Benchtop Meter
  • ST322 pH Electrode
  • Stand-Alone Electrode Holder
  • pH Mini Buffer Kit (4 x 50 mL) 

 

Item#:
ASAQUAPHMETER


OHAUS Starter Portable pH Meter

 

After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in the form of a portable pH meter. This portable meter offers convenience, reliability and durability in one compact design.
 

Main Attributes

  • Applications
    • pH, oxidation-reduction potential (ORP) measurement
  • Display
    • Liquid crystal display (LCD)
  • Operation
    • 4 AAA batteries (included)
  • Communication
    • N/A
  • Construction
    • ABS housing, wrist strap
  • Design Features
    • Automatic and manual temperature compensation, auto buffer recognition, calibration icon

Ordering Information
 
830339618303396230219114
ST300-B, ST322 3-in-1 Plastic Gel pH Electrode,
and pH Buffer Powder Sachet		300 Meter with IP54 Sets, Electrode Clip, Wrist Strap and 4 AAA Batteries
(Electrode Not Included)		ST300-B, ST322 3-in-1 Plastic Gel pH Electrode, pH Buffer Powder Sachet
(4.01, 7.00, 10.01),
Portable Bag
 

Item#:
AS300PHMETER


OHAUS Starter Portable Waterproof pH Meters

 

Durable, Waterproof, Battery-Operated, pH Meters Ideal for Field Testing.

 

Starter 400 Portable Water Analysis Meters are robust, lightweight, battery-operated units with waterproof housing, which makes them ideal for prolonged use in wet environments. Includes a rubber protective case fit for field testing. A rechargeable lithium battery ensures hours of trouble-free testing in the field. Intuitive software and an easy-to-view LCD allow for simple operation. A built-in USB port enables easy data transfer.
 

Main Attributes

  • Applications
    • pH, Oxidation-Reduction Potential (ORP) measurement
  • Display
    • Backlit Liquid Crystal Display (LCD)
  • Operation
    • Rechargeable lithium battery
  • Communication
    • Built-in micro-USB port
  • Construction
    • IP67 waterproof plastic housing, IP67 probes, rubber cover
  • Design Features
    • Data storage of up to 1000 items

Ordering Information
 
304689643046896530468966
400 Meter with IP67 Rubber Housing, Electrode Clip, Wrist Strap and 4 AAA Batteries
(Probes Not Included)		ST400-B with
ST320 IP67 3m Probe		ST400-F
with Portable Bag



Item#:
AS400PHMETER


OHAUS Starter Portable Multi-Parameter pH Meters

 

Durable, Waterproof Battery-Operated Multi-Parameter Meters Ideal for Field Testing.

 

Starter 400M Multi Parameter Portable Water Analysis Meters are robust, lightweight, battery-operated units with waterproof housing, which are ideal for testing pH, conductivity, TDS, salinity and resistivity in wet environments. A rechargeable lithium battery ensures hours of trouble-free testing in the field. Intuitive software and an easy-to-view LCD allow for simple operation. A built-in USB port enables easy data transfer.
 

Main Attributes

  • Applications
    • pH, Conductivity, TDS, Salinity and Resistivity Testing
  • Display
    • Backlit Liquid Crystal Display (LCD)
  • Operation
    • Rechargeable lithium battery
  • Communication
    • Built-in micro-USB port
  • Construction
    • IP67 waterproof plastic housing, IP67 probes, rubber cover
  • Design Features
    • Data storage of up to 1000 items 

Ordering Information
 
304689903046899130468992
400M Meter with IP67 Rubber Housing, Electrode Clip, Wrist Strap and 4 AAA Batteries
(Probes Not Included)		ST400M-B with
ST320 IP67 3m and
STCON3 IP67 3m probes		ST400M-F
with
Portable Bag
 

Item#:
AS400MPHMETER


The OHAUS High-Performance pH Meter for Standard Lab Applications (30058489) has been discontinued.

A replacement model (AB23PH-F) can be found here.

OHAUS pH Meters
 

ST2100-E

After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in a line of benchtop pH meters. Starter 2100 is the economical choice for applications requiring simple pH measurement.

Applications
pH, oxidation-reduction potential (ORP) measurement

Display
Liquid crystal display (LCD)

Operation
AC adapter (included)

Communication
N/A

Construction
ABS housing, built-in electrode holder

Design Features
Auto buffer recognition, two-point calibration, quick reference guide

 

ST3100-F

Starter 3100 has many smart features that make it as intuitive as it is accurate for standard pH measurement.

Applications
pH, oxidation-reduction potential (ORP) measurement

Display
Backlit liquid crystal display (LCD)

Operation
AC adapter (included)

Communication
RS232 (included)

Construction
ABS housing, standalone electrode holder, replaceable in-use cover

Design Features
99 measurement memory, automatic and manual endpoint functions, automatic and manual temperature compensation, quick reference guide

 

ST5000-F

Starter 5000 provides accurate pH and ORP measurement for high-level experiments and research. Enhanced features, advanced technology, and high performance have been combined to support complex laboratory tasks requiring pH measurement.

Applications
pH, oxidation-reduction potential (ORP) measurement

Display
Backlit liquid crystal display (LCD), touchscreen

Operation
AC adapter (included)

Communication
RS232 and USB (included). GLP/GMP data output with real-time clock.

Construction
ABS housing, standalone electrode holder, replaceable in-use cover

Design Features
3 endpoint modes, continuous measurement mode, up to 9-point calibration, 1,000 measurement memory

 

Specifications

 Item No.

30057495

30058489

30129896

 Model

ST2100-E

ST3100-F

ST5000-F

Measurement Range

-2.00 to 16.00 pH; 
-1999 to 1999 mV; 
0 to 100°C

-2.00 to 16.00 pH;
-1999 to1999 mV; 
-5°C to 110°C

-2.00 to 20.00 pH;
-2000.00 to +2000.00 mV; 
-30 to 130°C

Accuracy

±0.01 pH;  ±1 mV; 
±0.5 °C

±0.01 pH;  ±1 mV; 
±0.5 °C

± 0.03% mV;  ± 0.002 pH; 
± 0.1 °C

Measurement Resolution

0.01 pH;  1 mV; 
0.1 °C

0.01 pH;  1 mV; 
0.1 °C

0.001 pH;  0.01 mV; 
0.1 °C

Display

LCD

LCD with backlight

N/A 

ATC

 N/A

N/A

Yes

Electrode

ST210 (Included)

ST310 (Included)

ST350 (Included)

Accuracy ± (mV)

1 mV

1 mV

0.03 mV

Accuracy ± (Temperature)

0.5 °C

0.5 °C

0.1 °C

Battery Life

Not Applicable

Not Applicable

N/A 

Calibration

2 Point

3 Point

9 Point

Meter Type

 N/A

N/A

pH;  ORP

Dimensions

3.07 in x 8.66 in x 6.89 in
(78 mm x 220 mm x 175 mm)

3.07 in x 8.66 in x 6.89 in
(78 mm x 220 mm x 175 mm)

N/A 

In-use cover

No

Included

Included

Measurement Range (Temperature)

0°C to 100°C

-5°C to 110°C

-30°C to 130°C

Measurement Range

-1,999 mV to 1,999 mV

-1,999 mV to 1,999 mV

 N/A

Net Weight

1.65 lb (0.75 kg)

1.65 lb (0.75 kg)

19.5 oz (550 g)

Parameter

pH / ORP

pH / ORP

pH / ORP

pH accuracy (±)

0.01

0.01

0.002

pH measuring range

-2 to 16

-2 to 16

-2 to 20

pH resolution

0.01

0.01

0.001

Power

AC Adapter (Included)

AC Adapter (Included)

AC Adapter (Included)

Resolution (Voltage)

1 mV

1 mV

N/A 

Temperature Display

 N/A

N/A

Yes

Temperature Compensation

Yes

Yes

Automatic

Temperature Resolution

0.1°C

0.1°C

0.1°C

Temperature Sensor

30 KΩ NTC

30 KΩ NTC

30 KΩ NTC

Working Environment

41°F to 104°F, 80%RH, non-condensing (5°C to 40°C, 80%RH, non-condensing)

41°F to 104°F, 80%RH, non-condensing (5°C to 40°C, 80%RH, non-condensing)

50°F to 104°F, 85%RH, non-condensing (10°C to 40°C, 85%RH, non-condensing)

Protection Rating

 N/A

N/A

IP54
Item#:
ASPHMETEROHAUS

Enterprise 350 pH Meter

  • Simultaneous pH and temperature display
  • Storage of up to 32 results
  • Automatic or manual calibration 500 hours battery life
  • Application specific electrodes and consumables

The 350271 is a general purpose portable pH meter offering 1 or 2 point pH calibration and automatic buffer recognition with manual override. It simultaneously displays both the temperature compensated pH readings and the manually set temperature.

Specifications

 350271370271
pH range-2 to 16-2 to 16
pH resolution0.010.01
pH accuracy± 0.02± .02
Automatic buffer recognition4, 7, 9.22, 10 (with manual override)4, 7, 9.22, 10 (with manual override)
CalibrationUser selectable 1 or 2 pointUser selectable 1 or 2 point
mV range-----± 1999 mV (absolute or relative)
mV resolution-----1 mV
mV accuracy-----± 1 mV
Temperature range-----10 to 105°C
Temperature resolution-----0.1°C
Temperature accuracy----± 0.5°C
Manual temperature range0 to 100 ° C0 to 100°C
ConnectorBNCBNC
Power2 AA batteries2 AA batteries
Battery life500 hours (typical)500 hours (typical)
Size (l X w x d)175 x 75 x 35 mm175 x 75 x 35 mm
Weight250 g250 g
Item#:
ASPHMETER2

Jenway pH Meter 3510

The 3510 is a versatile, simple to use pH, mV and temperature meter that is ideal for routine analysis. With up to three decimal place resolution and a choice of up to three calibration points the 3510 provides the user with added flexibility where future demands for enhanced performance may be required. A choice of pH calibration buffers to DIN, JIS and NIST standards can be used for automatic calibration, as well as manually entered buffer values.


Specifications include:

  • Simultaneous readout of pH and temperature
  • pH resolution to 3 decimal places
  • 1, 2 or 3 point calibration
  • Automatic or manual buffer selection
  • Storage of up to 32 results
  • RS232 connection to printer or PC via optional DataWay PC software
  • Warranty: 2 years

3510 pH/mV meter supplied with glass combination pH electrode, electrode stand and holder, ATC probe, BNC shorting plug, pH 4, 7 and 10 buffers and US power supply

Specifications:

Parameter3510
pH range-2.000 to 19.999
pH resolution0.001 / 0.01 / 0.1
pH accuracy± 0.003
CalibrationUser selectable 1, 2 or 3 point
Automatic buffer recognitionJenway (2.00, 4.00, 7.00, 9.20 and 10.00), DIN, NIST, JIS
mV range± 1999.9 mV
mV resolution0.1 / 1 mV
mV accuracy± 0.2 mV
Temperature range-10 to 105°C
Temperature resolution0.1°C
Temperature accuracy± 0.5°C
ATC range0 to 100°C
Alarm points-
GLP-
OutputsAnalogue and RS232
ConnectorBNC
Power9VAC (adaptor included)
Size (L x W x D)210 x 250 x 55 mm / 8.3 x 10 x 2.2 in.
Weight850g / 2 lbs.
Item#:
ASPHMETERGLASS
Tris/TE compatible for
Tris buffer, semi-micro with 90mm reach, glass bodied for pH measurements in biological buffers, blood and protein samples (max. temperature 50°C)
Item#:
924030
Your Price:
532.41
Each
with electrode

3520 Bench pH/mV Meter (US)

  • Ideal for quality control and GLP applications
  • Up to 3 decimal place resolution
  • 1, 2 or 3 point pH calibration
  • Automatic or manual buffer selection
  • Multiple language options
  • Storage of up to 500 results
  • RS232 connection to printer or PC or infra-red (IrDA) communication
  • GLP compliant

    The 3520 dynamic pH/mV meter offers research grade specifications with a comprehensive range of features and functions, making it suitable for the broadest range of research, general laboratory, QC and GLP based applications. The built in data logger can store, print or output readings based on a wide range of trigger options, making this model suitable for monitoring and controlling pH levels.

    The 3520 pH/mV meter is supplied with glass combination pH electrode (924 005), electrode stand and holder, ATC probe (027 500), BNC shorting plug, pH 4, 7 and 10 buffer sachets and US power supply.

    Parameter

    3520

    pH range

    -2.000 to +20.000

    pH resolution

    0.001/0.01/0.1

    pH accuracy

    ±0.003

    Calibration

    User selectable 1, 2 or 3 point

    Automatic buffer recognition

    Jenway (2.00, 4.00, 7.00, 9.20 and 10.00), DIN, NIST, JIS

    mV range

    ±1999.9mV

    mV resolution

    0.1/1mV

    mV accuracy

    ±0.2mV

    Temperature range

    -10 to 105°C

    Temperature resolution

    0.1°C

    Temperature accuracy

    ±°0.5°C

    ATC range

    0 to 100°C

    Alarm points

    -2.000 to 19.999pH

    GLP

    Calibration reminder interval (1 to 999hrs)
    Alarm outputs (open collector and audible).
    Security code protected data

    Outputs

    Analogue, RS232and IrDA

    Connector

    BNC

    Power

    9V AC ±10% @ 50/60Hz

    Size (l x w x d)

    210 x 250 x 55mm

    Weight

    850g
Item#:
352101
2570.0000
Your Price:
2537.89
Each
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