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AquaMaster S300 Pro-2 soil pH and temperature meter with blue probe.
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Aqua Master Tools S300 Pro 2 Substrate pH/Temp

Official Aqua Master Tools Dealer Model: AMT1030
$159.95 USD
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  • Probes 0.0 to 14.0 pH with 0.1 pH resolution for precise nutrient management
  • Dedicated 90cm cable separates the sensor from the meter for easier maneuverability
  • IP65 waterproof rating on the main unit with an IP67 rated electrode for wet environment durability
  • View More Details

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VOLUME PRICING

Commercial & Bulk Purchasing

We support operations & licensed facilities with volume pricing, dedicated account managers, and custom equipment consultation.

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THROUGH THE Cultivator's LENS Hands-On Evaluation

  • You are adding root-zone monitoring because checking pots by hand tells you nothing about what is actually happening below the surface
  • You are switching to a plug-in probe because testing directly in substrate avoids the inaccuracy of slurry samples

  • The 90cm cord is the real win here since it lets you check multiple spots without constantly moving the display
  • We tell people to keep a small bottle of KCl solution handy because letting this probe dry out will kill it fast

  • Users who swapped out their old handhelds say they finally stopped seeing erratic readings when testing damp coco
  • Commercial operators report that the replaceable electrode saves them the cost of a full unit every season

Aqua Master Tools S300 Pro 2 Substrate pH/Temp

Testing pH in soil, coco, or any other soft, moist substrate isn't the same as dipping a pen into a reservoir — and most handheld meters aren't built for it. The Aqua Master Tools S300 Pro 2 solves that with a dedicated pH electrode on a 90cm cord, letting you probe directly into substrate or any liquid or substance while holding the meter comfortably in hand.

A 2-point automatic calibration makes setup quick and consistent, and the ergonomic rubber back keeps the meter comfortable during extended use across agriculture, horticulture, and food industry applications. The S300 Pro 2 ships with batteries included, and a replaceable probe extends the meter's usable life well beyond a standard pen.

For long-term accuracy, store the meter with KCl storage solution in the protective cover.

Features

🌱
Direct Substrate Testing

Measures pH and temperature directly in soft, moist substrates, liquids, or substances.

🔗
90cm Probe Cord

A 90cm cord connects the probe to the meter, keeping the display in hand while testing.

🎯
2-Point Auto Calibration

Calibrates quickly between 4.0 and 7.0 pH for consistently accurate readings.

🔌
Replaceable Probe

Swap the probe instead of replacing the whole meter, extending its usable lifetime.

✋
Ergonomic Grip

A rubber ergonomic back keeps the meter comfortable during extended testing sessions.

🔋
Battery Indicator

Displays battery status alongside automatic temperature compensation for reliable use.

What's Included

  • 1x S300 Pro 2 Substrate pH/Temp Meter
  • 3x 1.5V AG-13 Button Cell Batteries

Specifications

Specification Value
pH Range 0.0 – 14.0 pH
Temperature Range 0°C ~ 50°C (32°F ~ 122°F)
pH Resolution ± 0.1 pH
Temperature Resolution 0.1°C (1.0°F)
pH Accuracy ± 0.1 pH
Temperature Accuracy ± 0.5°C (32°F)
Temperature Compensation Range 0°C – 50°C (32°F – 122°F)
pH Calibration 2-point auto calibration, 4.0 – 7.0 pH
Power Supply 3 × 1.5V AG-13 Button Cell Batteries
Auto Power-Off After 8 minutes
Calibration Indicator Indicates correct calibration
Waterproof Rating IP65 (electrodes IP67 waterproof)
Meter Dimensions 220 × 40 × 40 mm
Weight 158 g
Package Dimensions 4.72 × 9.76 × 1.85 in

Video Tutorials

Frequently Asked Questions

Can this meter test directly in soil or coco? +

Yes, the S300 Pro 2 is built for direct measurement in soft, moist substrates, as well as liquids and other substances, across agriculture, horticulture, and food industry applications.

How long is the probe cord? +

The pH electrode connects to the meter via a 90cm cord, letting you probe into substrate while holding the display comfortably in hand.

How do I calibrate the meter? +

The S300 Pro 2 uses a 2-point auto calibration between 4.0 and 7.0 pH. Check the linked pH calibration video above for a full walkthrough.

Can I replace the probe myself? +

Yes, the probe is replaceable, extending the meter's lifetime. See the linked replacement video above for step-by-step instructions.

Does it come with batteries? +

Yes, the S300 Pro 2 ships with 3 included 1.5V AG-13 button cell batteries, so it's ready to use right out of the box.

How should I store the meter between uses? +

Store it with KCl storage solution in the protective cover to help keep the electrode accurate over time.

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Questions About This Product?

Our specialists are happy to help. Call us or send a message and we'll get back to you within one business day (most of the time within a few hours.)

Call (360) 800-5535

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