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OHAUS pH Meters
The OHAUS High-Performance pH Meter for Standard Lab Applications (30058489) has been discontinued.
A replacement model (AB23PH-F) can be found here.
OHAUS pH Meters
ST2100-E
After more than a century of perfecting the art of measurement through our durable weighing products, OHAUS precision is now available in a line of benchtop pH meters. Starter 2100 is the economical choice for applications requiring simple pH measurement.
Applications
pH, oxidation-reduction potential (ORP) measurement
Display
Liquid crystal display (LCD)
Operation
AC adapter (included)
Communication
N/A
Construction
ABS housing, built-in electrode holder
Design Features
Auto buffer recognition, two-point calibration, quick reference guide
ST3100-F
Starter 3100 has many smart features that make it as intuitive as it is accurate for standard pH measurement.
Applications
pH, oxidation-reduction potential (ORP) measurement
Display
Backlit liquid crystal display (LCD)
Operation
AC adapter (included)
Communication
RS232 (included)
Construction
ABS housing, standalone electrode holder, replaceable in-use cover
Design Features
99 measurement memory, automatic and manual endpoint functions, automatic and manual temperature compensation, quick reference guide
ST5000-F
Starter 5000 provides accurate pH and ORP measurement for high-level experiments and research. Enhanced features, advanced technology, and high performance have been combined to support complex laboratory tasks requiring pH measurement.
Applications
pH, oxidation-reduction potential (ORP) measurement
Display
Backlit liquid crystal display (LCD), touchscreen
Operation
AC adapter (included)
Communication
RS232 and USB (included). GLP/GMP data output with real-time clock.
Construction
ABS housing, standalone electrode holder, replaceable in-use cover
Design Features
3 endpoint modes, continuous measurement mode, up to 9-point calibration, 1,000 measurement memory
Specifications
Item No. |
30057495 |
30058489 |
30129896 |
Model |
ST2100-E |
ST3100-F |
ST5000-F |
Measurement Range |
-2.00 to 16.00 pH; |
-2.00 to 16.00 pH; |
-2.00 to 20.00 pH; |
Accuracy |
±0.01 pH; ±1 mV; |
±0.01 pH; ±1 mV; |
± 0.03% mV; ± 0.002 pH; |
Measurement Resolution |
0.01 pH; 1 mV; |
0.01 pH; 1 mV; |
0.001 pH; 0.01 mV; |
Display |
LCD |
LCD with backlight |
N/A |
ATC |
N/A |
N/A |
Yes |
Electrode |
ST210 (Included) |
ST310 (Included) |
ST350 (Included) |
Accuracy ± (mV) |
1 mV |
1 mV |
0.03 mV |
Accuracy ± (Temperature) |
0.5 °C |
0.5 °C |
0.1 °C |
Battery Life |
Not Applicable |
Not Applicable |
N/A |
Calibration |
2 Point |
3 Point |
9 Point |
Meter Type |
N/A |
N/A |
pH; ORP |
Dimensions |
3.07 in x 8.66 in x 6.89 in |
3.07 in x 8.66 in x 6.89 in |
N/A |
In-use cover |
No |
Included |
Included |
Measurement Range (Temperature) |
0°C to 100°C |
-5°C to 110°C |
-30°C to 130°C |
Measurement Range |
-1,999 mV to 1,999 mV |
-1,999 mV to 1,999 mV |
N/A |
Net Weight |
1.65 lb (0.75 kg) |
1.65 lb (0.75 kg) |
19.5 oz (550 g) |
Parameter |
pH / ORP |
pH / ORP |
pH / ORP |
pH accuracy (±) |
0.01 |
0.01 |
0.002 |
pH measuring range |
-2 to 16 |
-2 to 16 |
-2 to 20 |
pH resolution |
0.01 |
0.01 |
0.001 |
Power |
AC Adapter (Included) |
AC Adapter (Included) |
AC Adapter (Included) |
Resolution (Voltage) |
1 mV |
1 mV |
N/A |
Temperature Display |
N/A |
N/A |
Yes |
Temperature Compensation |
Yes |
Yes |
Automatic |
Temperature Resolution |
0.1°C |
0.1°C |
0.1°C |
Temperature Sensor |
30 KΩ NTC |
30 KΩ NTC |
30 KΩ NTC |
Working Environment |
41°F to 104°F, 80%RH, non-condensing (5°C to 40°C, 80%RH, non-condensing) |
41°F to 104°F, 80%RH, non-condensing (5°C to 40°C, 80%RH, non-condensing) |
50°F to 104°F, 85%RH, non-condensing (10°C to 40°C, 85%RH, non-condensing) |
Protection Rating |
N/A |
N/A |
IP54 |
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