AquaMaster S300 Pro 2 Substrate Pen - pH, temp

S300 Pro 2 Substrate pH & Temp Meter – Precision Testing for Cannabis Growing Media

Accurate pH & Temperature Readings Right at the Root Zone

The S300 Pro 2 Substrate Meter is your go-to tool for measuring pH and temperature directly in moist substrates like coco coir, soil, or rockwool—essential for cannabis cultivators who want to keep root zone conditions dialed in. Whether you're growing indoors or out, in pots or raised beds, this meter delivers fast, accurate data you can trust.

Designed for Root-Level Accuracy

• Dual Measurements: Accurately tracks pH and temperature in any soft, moist grow medium

• Ergonomic Grip: Comfortable, rubber-backed design for secure handling in the grow room

• Extended Reach: The pH probe is connected via a 90 cm flexible cable for easy positioning and deep media testing

• 2-Point Auto Calibration: Simple, accurate calibration to ensure consistent readings

• Replaceable Electrode: Extend the meter’s life with a new probe—no need to buy a whole new unit

• Batteries Included: Ready to go right out of the box

Perfect for Cannabis Growers Using:

• Coco coir

• Soil mixes

• Peat-based substrates

• Rockwool and other hydroponic media

Monitoring substrate pH is essential to prevent nutrient lockout and ensure your plants absorb the full spectrum of nutrients. The S300 Pro 2 gives you real-time insight into your root zone, helping prevent issues before they start.

Pro Tip:

Always store the pH electrode with KCI storage solution in the protective cap to extend sensor life and maintain accuracy.

Know what’s happening where it matters most—at the roots.
The S300 Pro 2 is a must-have for serious cannabis growers.