Versatility meets functionality for your measurement needs in the field

For maximum productivity on-the-go, choose from our selection of portable multiparameter meters. Choose a solution that eliminates the need to carry multiple portable meters into the field for your measurements—with one multiparameter meter, one hand is free to concentrate on collecting and recording your samples. Our portable multiparameter meters can measure pH, ion concentration, conductivity, dissolved oxygen, and temperature.

 

Premium

Premium

Premium

  Orion Star A325
Multiparameter meter

(STARA3250 series)
Orion Star A326
Multiparameter meter

(STARA3260 series)
Orion Star A329
Multiparameter meter

(STARA3290 series)
  Premium STARA3250 series Orion multiparameter meters Premium STARA3260 series Orion multiparameter meters Premium STARA3290 series Orion multiparameter meters
  Rugged, dependable multiparameter meter Rugged, versatile, and dependable multiparameter meter Versatile, powerful, multiparameter meter
Ideal for
applications in:
Industrial—cooling towers, wastewater; Environmental—ponds, lakes Industrial—wastewater; Environmental—ponds, lakes Industrial—wastewater, drinking water, food & beverage; Environmental—ponds, lakes
pH range –2.000 to 20.000 –2.000 to 20.000 –2.000 to 20.000
pH resolution 0.1/0.01/0.001 0.1/0.01/0.001 0.1/0.01/0.001
pH relative accuracy ±0.002 ±0.002 ±0.002
pH calibration points Up to 5 Up to 5 Up to 5
pH calibration editing Yes Yes Yes
mV, RmV range ±2,000.0 mV ±2,000.0 mV ±2,000.0 mV
mV, RmV resolution 0.1 mV 0.1 mV 0.1 mV
mV, RmV relative accuracy ±0.2 mV or ±0.05% of reading, whichever is greater ±0.2 mV or ±0.05% of reading, whichever is greater ±0.2 mV or ±0.05% of reading, whichever is greater
EH/ORP mode Yes Yes Yes
Conductivity range 0.001 μS to 3000 mS -- 0.001 μS to 3000 mS
Conductivity resolution 0.001 μS minimum, auto ranging, up to 4 significant digits -- 0.001 μS minimum, auto ranging, up to 4 significant digits
Conductivity relative accuracy 0.5% of reading ±1 digit > 3 μS, 0.5% of reading ±0.01 μS ≤ 3 μS -- ±0.5 % of reading ±1 digit for conductivity > 3 μS, ±0.5% of reading ±0.01 μS for conductivity ≤ 3 μS
Conductivity reference temperature 5, 10, 15, 20, 25ºC -- 5, 10, 15, 20, 25ºC
Conductivity temp. compensation Linear, nonlinear nLFn & nLFu, EP (USP), off -- Linear, (0 to 10.0 %/ºC), nonlinear nLFn & nLFu, EP (USP), off
Compatible cell constants 0.001 to 199.9 -- 0.001 to 199.9
Conductivity calibration points Up to 5 points -- Up to 5 points
Conductivity calibration editing Yes -- Yes
DO range, polarographic -- 0 to 600% saturation; 0 to 90 mg/L 0 to 90 mg/L
DO resolution, polarographic -- 0.1, 1% sat.; 0.01, 0.1 mg/L 0.01, 0.1 mg/L
DO relative accuracy, polarographic -- ±2 % sat. or ±2% of reading, whichever is greater; ±0.2 mg/L or ±2% of reading, whichever is greater ±0.1 mg/L up to 8 mg/L; ±0.2 mg/L from 8 to 20 mg/L; 10% of reading from 20 to 50 mg/L
DO range, RDO optical -- 0 to 500% saturation; 0 to 50 mg/L 0 to 500% saturation
DO resolution, RDO optical -- 0.1, 1% sat.; 0.01, 0.1 mg/L 0.1, 1% saturation
DO relative accuracy, RDO optical -- ±2 % sat. ≤ 200% sat., ±10 % sat. > 200% sat.; ±0.1 mg/L up to 8 mg/L, ±0.2 mg/L from 8 to 20 mg/L, 10% of reading from 20 to 50 mg/L ±2% sat. ≤ 200% sat., ±10% sat. > 200% sat.
DO barometric pressure correction -- 400 to 850 mmHg, automatic or manual 400 to 850 mmHg, automatic or manual
DO manual salinity factor correction -- 0 to 45 ppt Automatic with separate conductivity probe or manual; 0 to 45 ppt
DO calibration -- Water-saturated air, air saturated, water, manual (Winkler), and zero point Water-saturated air, air saturated, water, manual (Winkler), and zero point
Resistivity range 2 ohm to 100 meg-ohm -- 2 ohm to 100 meg-ohm
Resistivity resolution 1 ohm or 0.1 meg-ohm, auto ranging -- 1 ohm or 0.1 meg-ohm, auto-ranging
Resistivity relative accuracy 0.5% reading ±1 digit -- 0.5% reading ±1 digit
Salinity type Practical salinity or natural sea water -- Practical salinity or natural sea water
Salinity range 0.06 to 80.00 psu, 0.05 to 42.00 ppt -- 0.06 to 80.00 psu, 0.05 to 42.00 ppt
Salinity relative accuracy 0.5% reading ±1 digit -- 0.5% reading ±1 digit
TDS range 0.001 to 200.0 ppt -- 0.001 to 200.0 ppt
TDS relative accuracy ±0.5% reading ±1 digit -- ±0.5% reading ±1 digit
TDS factor range Linear 0.02 to 9.99 -- Linear 0.02 to 9.99
Temperature range –5 to 105°C, 23 to 221°F –5 to 105ºC, 23 to 221ºF –5 to 105ºC, 23 to 221ºF
Temperature resolution 0.1°C, 0.1°F 0.1ºC, 0.1ºF 0.1ºC, 0.1ºF
Temperature relative accuracy ±0.1ºC, ±0.1ºF ±0.1ºC, ±0.1ºF ±0.1ºC, ±0.1ºF
Temperature offset calibration 1 point 1 point 1 point
Number of datalogs 5000, with time and date stamp 5000, with time and date stamp 5000, with time and date stamp
Log function Manual, ready includes AUTOREAD, timed Manual, ready (includes AUTO-READ), timed Manual, ready (includes AUTO-READ), timed
pH electrode BNC, reference pin BNC, reference pin BNC, reference pin
Conductivity or ATC probe 8-pin mini-DIN 8-pin mini-DIN 8-pin mini-DIN
DO probe   9-pin mini-DIN 9-pin mini-DIN
Output power RS232, USB RS232, USB RS232, USB
AC adapter Optional—universal, 100–240VAC Optional—universal, 100–240VAC Optional—universal, 100–240VAC
Battery power Included—4AAs Included—4AAs Included—4AAs
Battery life 800 hrs 800 hrs 800 hrs
  Enhance your productivity with accessories for your benchtop and portable meters. Meter Accessories ›

Benchtop 
Multiparameter Meters

multiparameter benchtop meters

Equip your lab with our benchtop meters that provide dependable performance, accuracy, and reproducibility for your application or analysis needs. Learn more about how you can identify the best match based on your required features, performance, specifications, and budget.

Learn more  

Electrodes
and probes

electrodes probes and sensors

The accuracy and reliability of your conductivity measurements depends on the instrumentation you use. Learn more about how you can identify the best match based on your required features, performance, specifications, and budget.

Buffers and
solutions

buffers and solutions

Using high-quality, fresh solutions to calibrate and maintain your electrodes, probes, and sensors is an essential part of good laboratory practices. Fresh Thermo Scientific Orion solutions ensure your data is both accurate and reproducible when accuracy is critical.

Choose the best electrode for your application

This interactive Orion electrode selection guide will help you to find the perfect electrode for your application based on your requirements.

Find your electrode

Choose the right pH meter for your lab

This interactive Orion pH Meter Selector Tool will help guide you to the ideal Thermo Scientific Orion benchtop or portable meter and accessories based on your requirements. 

Find your meter

Resources
Support

Knowledge Base: Certificates of Analysis and SDS for Orion, ROSS, AQUAfast, AquaMate, and AquaSensors products.

Orion Meters Software and Upgrades
Thermo Scientific Orion benchtop and portable meters are designed to help deliver accurate, consistent results, day after day. Boost productivity by upgrading your software today.

Find your software