Grower Tip
- Calibrate at pH 7.00 first, then pH 4.00 for nutrient solutions below pH 8.0.
- Rinse the probe with distilled or deionised water before and after every test.
- Keep the capped probe moist with 3M KCL or pH 4.00 buffer; never store it in pure water.
- After a month unused, soak the probe in 3M KCL for 30 minutes before testing.
Features
The handheld tester displays solution pH and probe temperature from one compact meter.
A lithium glass membrane sensor provides the listed ±0.1 pH measurement accuracy.
Temperature compensation supports consistent pH measurement across changing solution temperatures.
Included pH 4.00 and 7.00 buffers cover calibration for nutrient solutions below pH 8.0.
The meter carries an IP67 rating and includes a removable shield around the glass sensor.
The LCD displays a smile icon when the result has remained stable for at least two seconds.
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1
Prepare the probe
Remove the cap, rinse the probe with distilled or deionised water and shake off excess moisture.
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2
Calibrate from neutral
Hold the calibration button and calibrate with pH 7.00 before moving to the pH 4.00 buffer.
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3
Rinse between buffers
Rinse with distilled or deionised water between calibration points and before testing the sample.
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4
Measure the sample
Immerse the probe at least 25mm, stir briefly, then hold it still.
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5
Wait for stability
Record the pH and temperature after the smile icon indicates a stable reading.
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6
Clean and store
Rinse after testing and close the cap with 3M KCL or pH 4.00 buffer to keep the electrode moist.
What comes with the AC Infinity pH Meter Kit?
The kit contains the AC-PHM3 pH meter, pH 4.00 and pH 7.00 calibration buffer solutions, and a travel lanyard. The two included buffers support the recommended calibration sequence for common hydroponic and nutrient-solution readings below pH 8.0.
Which calibration point should I use first?
Always begin with pH 7.00 when the meter is using the USA buffer series. Complete the pH 4.00 point afterward for expected readings below pH 8.0. Keep the meter switched on between points so the multi-point calibration sequence remains active.
How should I store the probe?
Keep the probe cap moist during daily or weekly use. For longer storage, fill one-quarter of the cap with 3M KCL solution or pH 4.00 buffer and close it tightly. Never store the probe in tap, reverse-osmosis, distilled or deionised water.
Can the whole meter be submerged?
No. The meter carries an IP67 protection rating, but the complete device should not be fully submerged. Immerse the sensing end at least 25mm into the sample, keep the meter upright where practical, and reinstall the protective cap after rinsing.
How often should I calibrate the meter?
Calibration frequency depends on use and conditions. A practical baseline is once a month, after a series of samples, or whenever readings appear inaccurate. The included buffers can support up to ten calibrations when closed tightly and stored at room temperature.
Description
A digital water quality meter designed to measure water’s acidity, alkalinity, and temperature to help optimize its quality for gardening and water treatment applications. The highly responsive sensor probe utilizes a lithium glass membrane to instantly determine pH readings with highly precise ±0.1 accuracy.
This pH pen tester for water features an IP-67 rating, specially sealed to withstand moisture and heat, as well as block out intrusive dust and sand.
For further protection, the hydroponic pH meter is built with a sensor shield to safeguard your probe in between uses.
The included 4.00 pH and 7.00 pH calibration solutions ensure consistently accurate measurements, the former also supporting proper storage conditions to help extend the lifespan of the pH and PPM meter.
APPLICATIONS
This fast-acting nutrient test alkalinity meter will help you determine how well your water uptakes nutrients. Fit for use as a pH meter for plants in horticultural settings like gardens, grow tents, greenhouses, and hydroponics systems. In addition, its application spans far beyond plant growing, capable of being a general pH level tester for water used in swimming pools, spas, aquarium fish tanks, and beverage homebrewing applications to help determine water safety.
KEY FEATURES
- A pH reader for water quality assessment designed to help monitor and maintain proper pH levels.
- Measures the acidity, alkalinity, and temperature of water for gardens, aquariums, pools, and more.
- Sensor probe with sensitive glass membrane delivers instant pH readings with high accuracy.
- IP-67 rated to be sealed from high-volume moisture, dust, and sand; can also withstand high levels of heat.
- Lab-grade pH monitor testing kit includes ready-to-use 4.00 & 7.00 solutions for long-lasting precision.
| Product Identification | |
| Manufacturer | AC Infinity Inc. |
| Product Name | pH Meter Kit |
| Product Model | AC-PHM3 |
| UPC Code | 819137024205 |
| Product Dimensions | |
| Total Dimensions | 1.65 x 1.18 x 7.01 in. (4.2 x 3.0 x 17.8 cm) |
| Product Performance and Technical Specs | |
| Sensor | pH and Temperature |
| Probe | Lithium Glass Membrane |
| Readings Precision | ±0.1 Accuracy |
| Included Solutions | 4.00 pH, 7.00 pH |
| Waterproof Rating | IP67 |
| Product Manual | |
| Product Manual |
 PDF |
| Calibration Instructions |
PDF |
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