Aqua Master S300 Pro2 Substrate pH and Temperature Meter

Aqua Master S300 Pro2 Substrate pH and Temperature Meter: measuring, monitoring and adjusting

The S300 Pro2 is the upgraded version of Aqua Master Tools' popular substrate pH meter. It was developed specifically to measure pH directly in the root zone, where it is crucial for nutrient uptake.
The robust stainless steel electrode is durable and moisture-resistant, and delivers fast, stable readings. The backlit display is easy to read even in dark grow rooms, while automatic temperature compensation (ATC) ensures accurate results at any ambient temperature.

Whether in soil, coco, rockwool or for pot and bed cultivation – the S300 Pro2 gives you reliable control over pH and temperature and helps prevent nutrient problems early.

Key benefits

• Accurate pH measurement directly in the substrate

• Robust stainless steel electrode with fast response

• ATC – automatic temperature compensation

• Large, backlit display

• Simple 1- or 2-point calibration

• Durable, moisture-resistant & low-maintenance

• Ideal for soil, coco & rockwool

Product description / product details

Effect & properties

The S300 Pro2 measures pH where it matters most – right next to the roots. Precise pH control prevents nutrient lockout, overfeeding and deficiencies.
The improved electrode is designed specifically for direct substrate measurement and delivers stable readings within seconds. Automatic temperature compensation corrects measuring errors that can occur with conventional pH meters in warm or cold substrates.

Suitable for the following growing systems

• Soil mixes

• Coco substrates

• Rockwool

• Indoor and outdoor pots

• Garden beds & raised beds

• Hydro/soil mixed systems (for substrate pH, not nutrient solution pH)

Use / dosage

Use

• Carefully insert the probe into the moist substrate

• Wait a few seconds until the reading is stable

• Read the pH and temperature values

Calibration:

• Automatic 1- or 2-point calibration

• Recommended every 2–4 weeks

Care:

• Clean the electrode after every use

• Never let it dry out

• For substrate only, not for pure nutrient solutions

Composition / material

• Stainless steel pH electrode

• Splash-proof housing

• Backlit LC display

• Calibration buttons

• Battery compartment (AAA)

Technical details

• Measuring ranges:

  • pH: 0.0 – 14.0

  • Temperature: 0 – 50 °C

• ATC (automatic temperature compensation)

• Display: backlit

• Probe material: stainless steel

• Power supply: 4×1.5V AAA batteries

• Dimensions: approx. 20 × 10 × 4 cm

• Weight: approx. 300 g

• Manufacturer: Aquamaster Tools