Portable Multiparameter Meters
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.
|Orion Star A325
|Orion Star A326
|Orion Star A329
|Rugged, dependable multiparameter meter||Rugged, versatile, and dependable multiparameter meter||Versatile, powerful, multiparameter meter|
|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 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|
|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 life||800 hrs||800 hrs||800 hrs|
|Enhance your productivity with accessories for your benchtop and portable meters. Meter Accessories ›|
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.
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.
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.
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.
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.