Adwa AD12 Waterproof Pocket pH Meter

Waterproof pH Testing with a Replaceable Probe

The ADWA AD12 Waterproof Pocket pH Meter combines pH and temperature measurement in a compact tester designed for routine water quality, laboratory, hydroponic, agricultural and field measurements. Its waterproof housing and replaceable combined pH/temperature probe make it particularly suitable for frequent testing where a conventional fixed-electrode pocket tester may have a limited service life.

The AD12 measures from -2.00 to 16.00 pH with 0.01 pH resolution and ±0.01 pH accuracy at 25°C. Temperature is measured from -5.0°C to +60.0°C and is used for automatic temperature compensation of pH readings.

±0.01 pH Accuracy

The AD12 provides a -2.00 to 16.00 pH measuring range with 0.01 pH resolution and ±0.01 pH accuracy at 25°C, providing detailed pH measurement in a portable pocket-sized instrument.

Replaceable pH and Temperature Probe

The modular AD11P combined pH/temperature probe can be replaced when required without replacing the complete meter. The probe is removed by unscrewing the retaining ring, helping extend the usable life of the instrument for frequent testing applications.

Waterproof Housing for Field and Routine Testing

The meter housing is sealed against humidity, making the AD12 suitable for testing environments where splashes and moisture are common. Its compact design allows the instrument to be used both at a workbench and at the measurement point.

Automatic Temperature Compensation

All pH measurements are automatically temperature compensated using the temperature sensor incorporated into the replaceable probe. This allows the AD12 to account for sample temperature during pH measurement without requiring a separate temperature probe.

Measure pH and Temperature on One Display

The two-row LCD displays pH and temperature information together, allowing both measurements to be checked without repeatedly switching between display modes. Temperature can be displayed in °C or °F.

Automatic 1 or 2-Point Calibration

The AD12 provides automatic one or two-point pH calibration with automatic buffer recognition. Two memorised buffer sets are available: pH 4.01 / 7.01 / 10.01 and pH 4.01 / 6.86 / 9.18.

Stability Indicator Helps Identify When to Read

A stability indicator appears while the measurement is settling and disappears once the reading has stabilised, helping the user identify the appropriate point at which to record the measurement.

Hold the Measurement on Screen

The built-in HOLD function freezes the current measurement on the display, making it easier to record a result after removing the tester from the sample.

Designed for Regular Testing

With waterproof construction, replaceable probe technology, automatic calibration and approximately 300 hours of battery operation, the AD12 is designed for repeated pH testing across water quality, hydroponic, agricultural and general aqueous measurement applications.

Key Features

• Waterproof pocket pH and temperature tester
• -2.00 to 16.00 pH measurement range
• 0.01 pH resolution
• ±0.01 pH accuracy at 25°C
• -5.0°C to +60.0°C temperature range
• Automatic Temperature Compensation (ATC)
• User-replaceable AD11P combined pH/temperature probe
• Automatic 1 or 2-point calibration
• Two selectable memorised buffer sets
• Automatic buffer recognition
• Two-row LCD displaying pH and temperature
• Stability indicator
• HOLD function
• Low battery indication
• Automatic power-off
• Approximately 300 hours battery life

Technical Specifications

Model	ADWA AD12
Measurement	pH / Temperature
pH Range	-2.00 to 16.00 pH
pH Resolution	0.01 pH
pH Accuracy at 25°C	±0.01 pH
Temperature Range	-5.0°C to +60.0°C (23.0°F to 140.0°F)
Temperature Resolution	0.1°C / 0.1°F
Temperature Accuracy at 25°C	±0.5°C / ±1°F
pH Calibration	Automatic, 1 or 2 point with automatic buffer recognition
Calibration Buffer Sets	pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18
Temperature Compensation	Automatic for pH measurements
Probe	AD11P replaceable combined pH/temperature probe
Display	Two-row LCD
Functions	HOLD, stability indicator, low battery indication
Battery	4 × 1.5V button batteries
Battery Life	Approx. 300 hours
Auto-Off	After 8 minutes of inactivity
Dimensions	175 × 39 × 23 mm
Weight	100 g

Typical Applications

• Water quality testing
• Hydroponics
• Agriculture and irrigation water
• Aquariums and aquaculture
• Laboratory testing
• Water treatment
• Environmental monitoring
• General aqueous sample testing

What’s Included?

• ADWA AD12 Waterproof Pocket pH Meter
• AD11P Replaceable pH/Temperature Probe
• Protective Cap
• pH 4.01 Calibration Buffer – 20 ml Sachet
• pH 7.01 Calibration Buffer – 20 ml Sachet
• 4 × 1.5V Batteries
• User Manual

Explore our complete range of pH testers and water quality meters for laboratory, field and water testing applications.