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Thermo Scientific Orion Star A221 Portable pH, mV, ORP, and Temperature Meter with IP67 Rating

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pH Range
-2 to 20
pH Accuracy
±0.002
mV Range
±2000.0 mV
mV Accuracy
±0.2 mV or ±0.05% of reading whichever is greater
Battery Type
4xAA
All 12 specifications
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Specifications 12

Brands
Thermo Fisher Scientific
New/Used
Used
pH Range
-2 to 20
pH Accuracy
±0.002
mV Range
±2000.0 mV
mV Accuracy
±0.2 mV or ±0.05% of reading whichever is greater
Battery Type
4xAA
Battery Life
800 hr.
IP Rating
IP 67
Dimensions
9x4x3”
Weight
2 lbs
Power
120V Universal Power Adaptor Or 4 x AA Batteries

Product description

Portable Thermo Orion Star A221 pH meter with ±0.002 accuracy, IP67 waterproof, and data logging for biotech applications.

The Thermo Scientific Orion Star A221 is a precision portable pH meter designed for comprehensive electrochemical analysis, including pH, millivolt (mV), oxidation-reduction potential (ORP), and temperature measurements. Ideal for biotechnology, molecular diagnostics, and environmental monitoring, this handheld meter supports up to 1000 data points with time and date stamping, enabling detailed bioprocessing workflows and laboratory data tracking.

Key features include:

  • Wide pH range: -2 to 20 with ±0.002 pH accuracy, essential for sensitive molecular biology assays and synthetic biology research
  • mV measurement range: ±2000.0 mV with ±0.2 mV or ±0.05% accuracy, supporting electrochemical sensor applications in biomanufacturing
  • Portable design: Operates on 4x AA batteries (approx. 800 hours battery life) or 120V universal power adapter for flexible field and lab use
  • Rugged IP67 waterproof rating: Ensures durability and reliability in diverse laboratory and bioprocessing environments, including live-cell imaging and clinical diagnostics
  • Large back-lit LCD with on-screen guidance: Facilitates ease of operation in complex workflows requiring precise pH and ORP control
  • Compact dimensions (9x4x3 inches) and lightweight (2 lbs) for ergonomic handheld use during gene editing, fermentation, or quality control processes

This meter is widely adopted in neuroimaging, biotechnology research, and synthetic biology, providing critical data in molecular diagnostics and bioprocess optimization. Its robust data logging and IP67 protection make it an indispensable instrument for laboratory professionals requiring reliable, accurate electrochemical measurements. The Thermo Orion Star A221 supports essential tasks in biomanufacturing pipelines and environmental biotechnology monitoring.

Included with the unit are the Thermo Orion Star A221 pH Meter (CAT# STARA2210), a 120V power cord, and a 30-day warranty, ensuring dependable support for your lab’s molecular and cellular analysis needs.

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Frequently asked questions

How long does laboratory equipment typically last?

With a service contract, ten to fifteen years is normal for most benchtop instruments. Detectors and pumps are the parts that wear first.

Can I get service for older equipment?

Often, yes. Verified suppliers frequently work with service partners converting the instrument. If applicable, we can list servicing options alongside the offer.

Where can I buy parts?

Ask a scientist through the request button. Parts are often available even when the instrument itself is discontinued.

What is the typical lead time for refurbished equipment?

Two to six weeks, depending on refurbishment scope and whether calibration is included.

Does laboratory equipment ship internationally?

We ship to 38 countries. Crating and customs handling are quoted with the instrument.

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Can't find the exact configuration?

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Last updated 8 November 2026