Ohaus pH Meters for Testing Water

Starter 300

Ohaus Starter 300

After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in the form of a portable pH meter. This portable meter offers convenience, reliability and durability in one compact design.

  • Intuitive Software that Powers the Starter Series — Intuitive software and a well-organized display work in tandem to make operating the Starter Series a simple and straightforward task.
  • Compact and Ergonomic Design Creates a User-Friendly Experience — Starter portable meters fit comfortably in the palm of your hand. Each meter also comes equipped with a retractable built-in stand that can be used to prop it up on a flat surface.
  • Reliable Calibration Results for Accurate Measurement — Starter portable meters track the accuracy of the calibration process right on the display, so that you can measure with peace-of-mind, knowing that your results will be highly precise.
  • With a meter stand, wrist strap for secure field use and IP54 housing, Starter 300 is durable and prepared for versatile use.
  • Automatic and manual temperature compensation ensure accurate readings while a 30 measurement library stores data for future reference.
  • The auto buffer recognition stores calibration data and helps to avoid errors during the calibration process.
Ohaus Starter 300 pH Portable pH Meters for Sale
Model Electrode Measurement Range Resolution Price  
ST300-B N/A 0.00 to 14.00 pH
-1999 to 1999 mV
0 to 100°C
0.01 pH
1 mV
0.1°C
$235.45
ST300-B Includes:
Starter 300 meter, IP54 Sets, electrode clip, wrist strap and 4 AAA batteries
ST300 ST320 0.00 to 14.00 pH
-1999 to 1999 mV
0 to 100°C
0.01 pH
1 mV
0.1°C
$312.80
ST300 Includes:
ST300-B, ST320 electrode, pH buffer powder set (4.01, 7.00, 10.01)
ST300-G ST320 0.00 to 14.00 pH
-1999 to 1999 mV
0 to 100°C
0.01 pH
1 mV
0.1°C
$335.75
ST300-G Includes:
ST300-B, ST320 electrode, pH buffer powder set (4.01, 7.00, 10.01), bag for portable meter

Starter 300 Specifications
Measurement Range 0.00 to 14.00 pH –1999 to 1999 mV 0 °C to 100 °C
Measurement Resolution 0.01 pH 1 mV 0.1°C
Error Limits ± 0.01 pH
± 1 mV
± 0.5 °C
Calibration 3 Points 4 Predefined Buffer Group
Memory 30 Measurements Last Calibration Data
Power Supply 4 AAA > 500 Operating Hours
Size/Weight Approximately 90 W × 150 D × 35 H mm / 0.18 kg (Without Batteries)
Display Liquid Crystal
Input BNC, Impedance > 10e+12 Ω Cinch, NTC 30 kΩ
Temperature Compensation ATC & MTC
IP Protection IP54
Housing ABS Plastic


Starter 400D DO PortableStarter 400D

Ohaus Starter ST400D - a practical, affordable, low-maintenance DO Portable Meter equipped with optical technology. The ST400D is ideal for applications that require simple yet accurate DO measurements.

  • The optical probe requires minimal maintenance –frequent membrane replacement not needed. Also, warm up and stirring of samples when taking measurements is not required.
  • Equipped with a color LCD display, the ST400D is designed to fit comfortably in the palm of your hands. The automatic/manual endpoints enable easy recall of last calibration data and stored information with one touch.
  • Simple calibration process offers quick delivery of measurements, and automatic temperature and barometric pressure compensation ensure accurate results.
Starter 400D Specifications
Measurement Range 0.0 to 200.0% 0.00 to 20.0 mg/L(ppm) 0 to 50 °C
Measurement Resolution 0.1% 0.01 mg/L(ppm) 0.1 °C
Barometric Range 50.0 to 115.0 kPa
Barometric Resolution 0.1 kPa
Error Limits ± 0.2 mg/L (<8 mg/L), ± 0.3 mg/L (8 to 20 mg/L); ± 0.3 °C ± 1.5 kPa
Calibration 1 or 2 points
Memory 99 Measurements Last Calibration Data
Power Supply 4 x AAA (LR03) Batteries, 12 hrs
Size/Weight Approximately 90 W × 150 D × 35 H mm / 0.16 kg (Without Batteries)
Display Liquid Crystal
Input Mini-DIN
Temperature Compensation ATC
Salinity Compensation 0.0 to 40.0 ppt
IP Protection IP54
Housing ABS Plastic


Starter 2100 pH BenchStarter 2100 Bench

OHAUS precision is now available in a line of Starter water analysis bench meters. The Starter bench meters include basic meters to premium performance products with advanced functionality, for measuring pH, conductivity, salinity, total dissolved solids (TDS), and oxidation reduction potential (ORP).

  • Intuitive Software that Powers the Starter Series — Intuitive software and a well-organized display work in tandem to make operating the Starter Series a simple and straightforward task.
  • Functional Design for Easy Operability — With five clearly marked input keys and built-in or stand-alone electrode holders, operating the Starter bench meters is a convenient process.
  • Reliable Calibration for Accurate Results — Starter bench meters track the accuracy of the calibration process right on the display, so that you can measure with peace-of-mind, knowing that your results will be highly precise.
  • With the attached quick guide, five clearly marked keys and user-friendly software, novices can operate the meter with minimal training.
  • The built-in electrode holder provides uncomplicated and convenient all-in-one operation while the large LCD display screen clearly displays results.
  • Auto buffer recognition, electrode condition icon, automatic temperature compensation and reference input, all work together to ensure accurate results.
Starter 2100 Specifications
Measurement Range 0.00…14.00 pH
–1999…1999 mV
0 °C…100 °C
Measurement Resolution 0.01 pH
1 mV
0.1 °C
Error Limits ± 0.01 pH
± 1 mV
± 0.5 °C
Calibration 1 or 2 Points
1 Predefined Buffer Group
(1.68, 4.01, 7.00, 10.01)
Memory Last Calibration Data
Power Supply 110-240V/50Hz, DC 12V
Size/Weight Approximately 220 W × 175 D × 78 H mm / 0.75 kg
Display Liquid Crystal
Input BNC, impedance > 10e+12 Ω
Cinch, NTC 30 kΩ
2 mm
Temperature Compensation ATC & MTC
Housing ABS


Starter 3100 pH Bench

Starter 3100 pH Bench

Starter 3100 offers premium features at a cost-effective price point for reliable and convenient pH and ORP measurements.

  • Starter 3100’s intuitive software includes three point calibration, three buffer groups, automatic and manual endpoint functions, as well as a 99 item library.
  • Among Starter 3100’s user-friendly features that support ease-of-use are an adjustable stand-alone electrode holder and large backlit LCD display.
  • Documenting measurement data is made simple through the RS232 which can be used to connect peripheral devices such as printers or computers to the meter.
Starter 3100 Specifications
Measurement Range -2.00…16.00 pH
–1999…1999 mV
-5 °C…110 °C
Measurement Resolution 0.01 pH
1 mV
0.1 °C
Error Limits ± 0.01 pH
± 1 mV
± 0.5 °C
Calibration Up to 3 Points
3 Predefined Buffer Groups
Memory 99 Measurements
Last Calibration Data
Power Supply 110-240V/50Hz, DC 12V
Size/Weight Approximately 220 W × 175 D × 78 H mm / 0.75 kg
Display Liquid Crystal Backlight
Input BNC, impedance > 10e+12 Ω
Cinch, NTC 30 kΩ
2 mm
Temperature Compensation ATC & MTC
Housing ABS plastic


Starter 3100C Conductivity Bench

Starter 3100C

Ohaus Starter 3100C can test for conductivity, salinity, and TDS and has many smart features that make it as intuitive as it is accurate for standard conductivity measurement. With many advanced intuitive features, Starter 3100C is the ideal meter for standard testing of conductivity, total dissolved solids (TDS) and salinity.

  • Starter 3100C’s intuitive software includes 1 point calibration, 4 pre-defined standards, automatic and manual endpoint functions, and one touch conversion between measurement modes.
  • Among Starter 3100C’s user-friendly features that support ease-of-use are an adjustable stand-alone electrode holder and large backlit LCD display.
  • Documenting measurement data is made simple through the RS232 which can be used to connect peripheral devices such as printers or computers to the meter.
Starter 3100C Specifications
Measurement Range 00.0 μS/cm
…199.9 mS/cm 0.1 mg/l…199.9 g/l (TDS)
0.00 ... 19.99 psu (Salinity)
0 °C…100 °C
Measurement Resolution Automatic Range 0.1 °C
Error Limits ± 0.5 % of the Measured Value
± 0.3 °C
Calibration 1 Point
4 Predefined Standards
Memory 99 Measurements
Last Calibration Data
Power Supply 110-240V/50Hz, DC 12V
Size/Weight Approximately 220 W × 175 D × 78 H mm / 0.75 kg
Display Liquid Crystal Backlight
Input Mini-DIN
Temperature Compensation Linear: 0.00 %/°C…10.00 %/°C
Reference Temperature: 20 & 25 °C
Housing ABS plastic