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OHAUS AB33M1-F AQUASEARCHER Benchtop Multi-Parameter Meter

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MSRP: $925.00
(You save $138.75)
Usually ships within 2-3 days

The OHAUS AquaSearcher™ AB33 benchtop 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 6.5 inch LCD display and touch keypad makes changing the parameters, executing setup, and performing calibration as simple as using a smartphone.


  • Multi-parameter meter provides 7 measurements including pH, ORP, conductivity, TDS, salinity, resistivity and temperature
  • i-Steward Indicators include pH electrode condition, “Electrode Dirty/Broken,” and reminder when meter needs recalibration
  • On-screen prompts, menu-specific function keys and multilanguage interface shown on a 6.5” large backlit LCD display
  • Multifunctional capacitive touch keypad makes measurement simple and fast
  • Automatic endpoint mode and automatic buffer recognition
  • Automatic temperature compensation 
  • Adjustable TDS factor
  • 1000 item internal memory
  • Standard RS232 and USB interface
  • Calibration trail allows for efficient data documentation
  • Selectable reading reference temperatures of 20 or 25 ºC with linear curve options


  • AB33M1 meter
  • STCON3 conductivity electrode
  • ST310 pH electrode
  • Starter pH Buffer Mini Kits (4 × 50mL)
  • Starter Conductivity Standard Kits (1413 uS/cm, 4 × 50mL)
  • Standalone electrode holder
2 year manufacturer's warranty
Conductivity Measurement Range:
0.01 μS/cm – 500 mS/cm
Conductivity Accuracy:
± 0.5 % Reading ± 2 Least Signficant Digit
TDS Measurement Range:
0.1mg/L to 199.9 g/L
TDS Measurement Resolution:
0.01 mg/L minimum, auto-range
TDS Accuracy:
± 0.5 % Reading ± 2 Least Signficant Digit
Practical Salinity Measurement Range:
0 to 100 psu
Practical Salinity Measurement Resolution:
0.01 psu minimum, auto-range
Practical Salinity Accuracy:
± 0.5 % Reading ± 2 Least Significant Digit
Temperature Measuring Range:
-5.0 to 110.0°C
Temperature Accuracy:
± 0.3 °C, ±0.3 °F
Resistivity Measurement Range:
2 to 100 MΩ-cm
Resistivity Measurement Resolution:
0.01 Ω-cm auto-range
Resistivity Accuracy:
± 0.5 % Reading ± 2 Least Signficant Digit
Up to 5 points for pH; 1 point cell constant calibration; 6 conductivity standard solutions available (10, 84, 146.5, 500, 1413 μS/ cm and 12.88mS/cm)
6.5" Segment & Dot matrix LCD with backlight
English, Spanish, French, Portuguese, Chinese, Russian and Turkish
Measurement End-point Modes:
Auto-stop, Continuous
Datalog for Measurements:
1000 sets data points with time and date stamp
Capacitive touch
Connect to PC via RS232 and USB, Connect to Printer via RS232
Universal, 100-240 VAC, 50-60 Hz
Working Environment:
5 to 40 ˚C, 5 to 80 %, non-condensing
Dimensions (L x W x H):
8.3 x 5.6 x 2 in.
1.1 lbs
Item No.:
Product Type:
Multi-Parameter Meter
STCON3 conductivity electrode and ST310 pH electrode included
ORP, Redox Measurement Range:
±2000.0 mV
ORP, Redox Resolution:
ORP, Redox Accuracy:
±0.5 mV
ORP, Redox Units:
mV, RmV
pH Measurement Range:
-2.00 to 20.00 pH
pH Resolution:
0.1/0.01 pH
pH Accuracy:
± 0.01 pH
pH Selectable Resolution:
pH Pre-Defined Buffer Groups:

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