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Thermo Scientific™ Orion™ Star A325 pH, Conductivity and Temperature Portable Waterproof Multiparameter Meter Kit - PROMO

Retrieve accurate results from any location with the Thermo ScientificTM Orion StarTM A325 pH/Conductivity Portable Multiparameter Meter.

Manufacturer:  Thermo Scientific™ STARA3255PM

Catalog No. 13-645-565PM



Key Points:

  • Get the information you need quickly and easily from the large, backlit graphic LCD display, which shows individual pH/mV/RmV or conductivity/TDS/salinity/resistivity results with temperature, or all results at once.
  • Additional helpful information includes electrode status, time, date, sample ID, user ID and calibration points.
  • Advanced features such as stability and averaging provide additional options allowing for laboratory accuracy everywhere you need it.
  • Plain language screen prompts and soft keys that update for easy selection
  • Multi-language interface that supports English, Spanish, French, Italian, German and Chinese


  • Thermo Scientific™ AUTO-READ™ locks in the stable reading on your screen, ready indicator alerts when readings are stable and timed reading gathers data in specific time intervals
  • Up to five point pH calibration offers automatic recognition for USA/NIST™ and DIN buffers
  • Calibration editing allows user to fix pH calibration errors without a complete recalibration.
  • Selectable cell constant allows for use with 2- or 4-cell conductivity cells.
  • Selectable reading reference temperatures of 5°, 10°, 15°, 20° or 25°C with linear, nonlinear, nLFu or EP curve options offer advanced accuracy in conductivity readings.
  • User can choose practical salinity or natural sea water curves for salinity readings.
  • Linear or ISO/EN 27888 curves for TDS are available.
  • USB and RS232 ports and complimentary data analysis software allow user to easily transfer data and keep meter software up to date.


Universal 50 to 60 Hz, 100 to 240 VAC power adapter (sold separately)
0.5% of reading ±1 digit
0.5% of reading ±1 digit
Yes, selectable
4 AA (included)
1 point relative mV (RmV) mode, 1 point ORP mode
pH with calibration editing option, relative mV (RmV), ORP, conductivity with calibration editing op
CE, TUV 3-1, FCC Class A
5000 with date and time stamp
24 x 10 x 6.5 cm (9.5 x 3.9 x 2.6 in.)
BNC (pH or ORP electrode), pin-tip (reference electrode), 8 pin MiniDIN (conductivity sensor with built-in temperature or ATC temperature probe)
Comprehensive with menu-specific function keys and dual purpose scroll/shortcut keys
Automatic data logging with Auto-Read and Timed measure modes; manual data logging with Continuous m
10 per channel with password protection
4 AA batteries (included) or universal AC adapter (sold separately)
±2000 mV
0.001 µS minimum, auto ranging up to 4 significant digits
0.01 psu or 0.01 ppt minimum, auto ranging
0.1 mV
Selectable fast, medium, slow or Smart Stability setting; Selectable off or Automatic Smart averaging setting
41°F to 113°F (ambient)
5, 10, 15, 20, 25°C
22.0°F to 221.0° F
Manual or automatic with ATC temperature probe
1.2 lb.
IP 67
USB, RS232
2 ohm to 100.0 meg-ohm
0.001 to 200.0 ppm
-2 to 20
-5.0°C to +105.0°C
0.5% of reading ±1 digit > 3 µS; 0.5% of reading ±0.01 µS ≤ 3 µS
0.5% of reading ±1 digit
±0.2 mV or ±0.05% of reading whichever is greater
High/low limit alarm, calibration due alarm
800 hr.
Up to 5
1 to 5
0.001 to 199.9 cm-1
Transfer single, range or all data points to printer or computer
Orion Star A325 pH/conductivity portable meter kit with ROSS Ultra Triode low maintenance gel pH/ATC electrode, DuraProbe 4-cell conductivity sensor, solutions, meter armor and field case
Orion STAR A325 pH/conductivity portable meter; 8107UWMMD Orion ROSS Triode pH/ATC gel-filled electrode with 3 m cable; 013010MD Orion DuraProbe conductivity cell with 3 m cable; 910410 pH 4.01 buffer pouches, pack of 10; 910710 pH 7.00 buffer pouches, pack of 10; 911010 pH 10.01 buffer pouches, pack of 10; 01100710 conductivity standard pouches, 1413 uS; 911110 rinse solution, pack of 10; protective armor with electrode holder; hard carrying case and batteries
7.000 pH
English, Spanish, French, Italian, German and Chinese; Portuguese and Korean available with software update
Non-volatile memory preserves data log, calibration log and meter settings
Orion Star A325 pH/mV/RmV/ORP/Conductivity/TDS/Salinity/Resistivity/Temperature Portable Meter
±2000 mV
5 to 85%, non-condensing
1 ohm or 0.1 meg-ohm, auto ranging
0.001 ppm minimum, auto ranging up to 4 significant digits
Practical salinity (psu) or natural sea water (ppt)
Linear (0.02 to 9.99)
Linear, nLFn (non-linear ultra pure water), nLFu (non-linear ultra pure degassed water), EP (off with warning) or off
5°C to 45°C (ambient)
1 point temperature offset calibration
0.1°C, 0.1°F
3 Year Meter
0.5 kg
LCD Graphic, Backlit
pH, mV, relative mV (RmV) or ORP with temperature; conductivity, TDS, salinity or resistivity with t
0.001 μS/cm to 3000 mS/cm
0.06 to 80.00 psu, 0.05 to 42.00 ppt
±2000 mV
Product Certifications