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• Automatic/manual temperature compensation for accurate readings 
• ORP or temperature electrode connectivity for additional functionality 
• IP54 protection shields water/dust damage 
• Automatic and manual temperature compensation ensures 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. 
• With a meter stand, wrist strap for secure field use and IP54 housing, Starter 300 is durable and prepared for versatile use.

The OHAUS ST300 portable pH meter offers convenience, reliability and durable construction in an ergonomic compact design. Intuitive software and a well-organized display make the ST300 user friendly. A built-in retractable stand provides an additional level of convenience. A clear LCD screen and five clearly marked keys offer simplicity for novices and professionals alike. IP54 protection shields the portable ST300 pH meter from damage by dust and water. Quickly recall calibration data and information with a single touch. Connection of an ORP or temperature electrode adds additional functionality to the ST300 portable pH meter. 1 year warranty.

OHAUS ST300-B includes: 300 Meter, IP54 sets, electrode clip, wrist strap and 4 AAA batteries (electrode not included).

Item Number Item Description PQ Price Qty Avail Quantity
pH Meter, Digital, Portable
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  Not Subject to Discount
Measurement Range 0.00 – 14.00 pH;
-1999 – 1999 mV;
0 – 100 °C
Measurement Resolution 0.01 pH;
1 mV;
0.1 °C
Calibration 3 Point
Accuracy ± (mV) 1 mV
Temperature Compensation Automatic
Display LCD
Working Environment 5°C – 40°C, 80%RH, non-condensing
Working Environment  41°F – 104°F, 80%RH, non-condensing
Net Weight  0.16 kg (0.35 lb)
Resolution (Voltage) 1 mV
pH measuring range 0 – 14
pH resolution 0.01
Measurement Range (Voltage) -1,999 mV – 1,999 mV
Parameter pH / ORP
Temperature resolution 0.1 °C
Measurement Range (Temperature)  0 °C – 100 °C
Electrode Not included
Accuracy ±0.01 pH;
±1 mV;
±0.5 °C
Power 4 AAA (LR03) Batteries (Included)
In-use cover No
Accuracy ± (Temperature) 0.5 °C
Battery Life 500 Hours with Disposable Batteries
Temperature Sensor 30 KΩ NTC
Dimensions (Width)  90.0 mm (3.54 in)
pH accuracy (±) 0.01
Dimensions (Height)  33.0 mm (1.38 in)
Dimensions (Length)  170.0 mm (6.69 in)