Limited Time Offer: Save an Extra 5% on Your OD600 Purchase!

For a limited time, enjoy an extra 5% off your first order of the OD600 with MIDSCI!
 Simply reference promo code #ODNEW525 at checkout to claim your discount.

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Feel free to reach out to us at tech@midsci.com — we’re here to help you equip your lab with the best tools!

This offer cannot be combined with other discounts, quoted pricing, or institutional pricing. Not valid on prior purchases, taxes, or shipping/processing fees.
The special discount applies only to the listed item at the current online price; substitutions are not permitted.
Promo valid only for first-time purchase of the OD600 unit. Promo expires on 06/30/25. All terms and conditions apply.
 
 

Implen OD600®

Enhancing Microbial Growth Analysis, the Implen OD600® offers a cutting-edge solution designed to streamline and elevate your laboratory measurements. Featuring two built-in programs, OD600 and McFarland, along with a sample-list function for easy data management and export, this device offers unparalleled accuracy and convenience.

The OD600 program enables precise monitoring of bacterial growth in liquid culture media by measuring the optical density at 600 nm, essential for determining growth stages and optimal harvesting conditions. The McFarland program simplifies the estimation of cell suspension density, aiding in tasks such as antimicrobial susceptibility testing and bacterial inoculum preparation.

The Implen OD600® is ideal for diverse laboratory environments worldwide, thanks to its user-friendly design, robust data management capabilities, and seamless LIMS integration. Its multilingual support and adaptable sample compatibility further enhance its versatility. This makes the Implen OD600® perfect for various industries and applications, including microbiology, biotechnology, pharmaceuticals, water quality monitoring, breweries and wineries, the food and beverage industry, clinical and medical research, environmental science, and industrial applications.

Benefits

• Accurate Growth Monitoring: Track bacterial growth phases—from lag to log and beyond—to ensure cells are harvested at peak viability.
• Mobility: Unlimited mobility, suitable for use in fieldwork, safety cabinets, and in incubation chambers, even under anaerobic conditions. (Certain restrictions or limitations apply)
• Efficient Data Management: 4GB internal storage allows for storing over 500,000 measurements. Ensures efficient data management and quick access to all previously measured sample data through the sample list feature.

Product Features

• Higher concentration range, accuracy and reproducibility!
• Pre-programmed with Intuitive OD600 & McFarland Applications
• Utmost Compatibility (DiluCell, Cuvette, Tubes) Without Adapters
• User-friendly, Multilingual Interface
• Stand-alone Operation
• Glove-Compatible 3.5 In. Touch Screen Display
• Integrated Battery with a Runtime > 8 hours (continuous use)
• High Precision Versatile Measurements, Linear up to 4 A
• Data Export to USB in .cvs and .xls Formats
• Large Data Storage & Universal Capabilities
• Easy LIMS integration via WiFi, LAN/Ethernet (REST API PUSH)
• Extremely Lightweight, Compact and Portable
• No Maintenance or Recalibration Needed Ever!

Applications

• Microbiology and Biotechnology: Accurate microbial growth and cell density measurements.
• Pharmaceuticals: Enhanced bioprocess monitoring and liquid pharmaceutical quality testing.
• Water Quality Monitoring: Compliance with safety standards for drinking water, environmental monitoring, and wastewater treatment.
• Breweries and Wineries: Fermentation process control and product quality assurance.
• Food and Beverage Industry: Product quality assurance and microbial growth monitoring.
• Clinical and Medical Research: Diagnostic assay development and vaccine production.
• Environmental Science and Industrial Applications: Ecosystem monitoring, soil microbiology studies, chemical manufacturing quality control, and bioremediation projects.

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.

• 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

Specifications
 

Item #	30589830	30589831
Measurement Range	-2.000 to 20.000 pH;  -10.0ºC to 125.0ºC;  -2000.00 to +2000.00 mV
Measurement Resolution	0.1°C;  0.1 mV;  0.001 pH
Accuracy	±0.3°C;  ±0.3 mV;  ± 0.002 pH
Display	LCD with backlight & one-line dot matrix
Electrode	Not included	ST410 (Included)
Accuracy ± (mV)	0.3 mV
Accuracy ± (Temp.)	0.3ºC
Dimensions (D x W x H)	8.3 x 5.6  x 2 In. | 210 x 142 x 51 mm
Net Weight	1.1 lb | 0.5 kg
Parameter	pH / mV / ORP
pH accuracy (±)	0.002 (±)
Power	AC Adapter (Included)
Temp. Sensor	No	30 KΩ NTC
Work Environment	41 ºF to 104 ºF (5 °C to 40 °C), 80% RH, Non-condensing

 

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.

• 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

Specifications
 

Item #	30589826	30589827
Measurement Range	-5°C to 110°C;  -2000.00 to +2000.00 mV;  -2.00 to 16.00 pH
Measurement Resolution	0.1°C;  1 mV;  0.01 pH
Accuracy	±0.5°C;  ±1 mV;  ±0.01 pH
Display	LCD with backlight & one-line dot matrix
Electrode	Not included	ST310 (Included)
Accuracy ± (mV)	1 mV
Accuracy ± (Temp.)	0.5°C
Dims (D x W x H)	8.3 x 5.6 x 2 In. | 210 x 142 x 51 mm
Net Weight	1.1 lb | 0.5 kg
Parameter	pH / mV / ORP
pH Accuracy (±)	0.01
Power	AC Adapter (Included)
Temp. Sensor	No	N/A
Work Environment	41ºF to 104ºF (5ºC to 40ºC), 80% RH, Non-condensing

 

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.

• 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

Specifications
 

Item #	30589824	30589825
Measurement Range	-5°C to 110°C;  -2000.00 to +2000.00 mV;  -2.00 to 20.00 pH
Measurement Resolution	0.1°C;  0.1 mV;  0.01 pH
Accuracy	±0.3°C;  ±0.5 mV;   ±0.01 pH
Display	LCD with backlight & one-line dot matrix
Electrode	Not included	ST310 (Included);  STCON3 (Included)
Accuracy ± (mV)	0.5 mV
Accuracy ± (Temp.)	0.3°C
Conductivity Accuracy (±)	0.50%
Conductivity Measuring Range	0.01 – 500 mS / cm
Dims (D x W x H)	8.3 x 5.6 x 2 In. | 210 x 142 x 51 mm
Net Weight	1.1 lb | 0.5 kg
Parameter	pH / Cond.
pH Accuracy (±)	0.01
Power	AC Adapter (Included)
Resistivity Measuring Range	2 Ohm to 100 MOhm
Resistivity Resolution	0.01 Ohm
Temp. Sensor	No	N/A
Work Environment	41ºF to 104ºF (5ºC to 40ºC), 80% RH, Non-condensing

 

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.

• 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) 

Don’t forget to check out our PR1MA Buffers!
 

Specifications
 

Measurement Range	0 - 100ºC 0.00 - 14.00 pH -1999 - 1999 mV
Measurement Resolution	0.1ºC 0.01 pH 1 mV
Accuracy	±0.5ºC ±0.01 pH ±1 mV
Dimensions (D x W x H)	8.3 x 5.6 x 2 In. 210 x 142 x 51 mm
Net weight	0.8 lb. | 0.38 kg.
Display	LCD w/ backlight
Electrode	ST322 (Included)
Parameter	pH / ORP
Power	AC Adapter (Included)

 

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.

• 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

Specifications
 

83033961	83033962	30219114
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 #	83033961	83033962	30219114
Measurement Range	0 – 100°C;  0.00 – 14.00 pH;  -1999 – 1999 mV
Measurement Resolution	0.1 °C;  0.01 pH;  1 mV
Accuracy	±0.5 °C;  ±1 mV;  ±0.01 pH
Display	LCD
Electrode	ST322(Included)	ST320 (As Accessory)	ST322(Included)
Accuracy ± (mV)	1 mV
Accuracy ± (Temp.)	0.5 °C
Battery Life	500 Hours with Disposable Batteries
Calibration	3 Point
Dims (D x W x H)	6.69 in x 3.54 x 1.38 In. | 170 x 35 x 90 mm
In-Use Cover	No
Measurement Range (Temp.)	0°C to 100°C
Measurement Range (mV)	-1,999 mV to 1,999 mV
Net Weight	0.35 lb | 0.16 kg
Parameter	pH / ORP
pH Accuracy (±)	0.01
pH Measuring Range	0 to 14
pH Resolution	0.01
Power	4 AAA (LR03) Batteries (Included)
Resolution (Voltage)	1 mV
Temp. Compensation	Yes		Automatic
Temp. Resolution	0.1 °C
Temp. Sensor	30 KΩ NTC
Work Environment	41°F to 104°F (5°C to 40°C), 80% RH, Non-condensing

 

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.

• 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 

Specifications
 

30468990	30468991	30468992
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

 

Measurement Range	0-20 MΩ•cm | -5 °C to 110 °C | -2.00 to 16.00 pH | 00.0 μS/cm to 199.9 mS/cm  0.1 mg/L to 199.9 g/L (TDS) | -1999 to 1999 mV | 0-99.9 psu
Measurement Resolution	0.01 mg/L |  0.01 psu |  0.1 °C | 0.1 μs/cm | 0.01 pH | 0.01 Ω•cm | 1 mV
Accuracy	± 0.5 % F.S.; ±0.3 °C; ±1 mV; ±0.01 pH
Display	LCD Backlit Display
Electrode	ST320 IP67 3m | STCON3 IP67 3m | *Not included with Item # 30468991
mV Accuracy	± 1 mV
Temp. Accuracy	± 0.3 °C
Battery Life	40 Hours with Rechargeable Battery
Conductivity Accuracy	± 0.5%
Conductivity Range	0.01 μS/cm to 199.9 mS/cm
Dimensions (D x W x H)	9.05 x 1.57 x 3.94 In. | 230 x 40 x 100 mm
Temp. Range	-5 °C to 110 °C
Measurement Range	-1,999 mV to 1,999 mV
Net Weight	0.77 lb | 0.35 kg
pH Accuracy	± 0.01
pH Measuring Range	-2 to 16
pH Resolution	0.01
Resistivity Measuring Range	0 MOhm to 20 MOhm
Resistivity Resolution	0.01 MOhm
Resolution Cond.	0.1 to 199.9 (Variable)
Resolution	1 mV (Voltage)
Temp. compensation	Automatic
Temp. resolution	0.1 °C
Temp. Sensor	30 KΩ NTC
Work Environment	41°F to 104°F (5°C to 40°C), 80% RH, Non-condensing

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.

• 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

Specifications
 

30468964	30468965	30468966
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

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

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.

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:

• Compact basic series - for the usual applications, made from the universal A-type membrane glass
• Comfortable handling, stylish design and reliable function
• Liquid electrolyte electrodes with unique platinum diaphragm and refill port slider
• Each electrode with individual serial number
• Fits both Pinnacle and SI Analytics pH meters
• Includes 1 m fixed cable