Meters & Sensors
Shop precision sensors and meters for monitoring every aspect of your grow environment, from pH and EC probes to temperature, humidity, and water content sensors. Stocking Bluelab, DimLux, and Trolmaster, our range includes both standalone handheld meters and sensor probes designed to integrate with your existing environmental controller.
Standalone meters vs integrated sensor probes
Handheld meters (like the Bluelab pH Pen or Truncheon) are ideal for quick, manual spot-checks of your reservoir — no controller required, just dip and read. Sensor probes (like Trolmaster's PCT and PPH series) are designed to connect permanently to a controller system, feeding continuous data for automated monitoring and alerts, rather than requiring manual checks.
What each sensor type measures
- pH probes — measure how acidic or alkaline your nutrient solution is, critical for nutrient availability
- EC/conductivity probes — measure the concentration of dissolved nutrients in your solution
- Water content sensors — inserted directly into your growing medium (coco, soil, rockwool) to measure moisture percentage, supporting precise "crop steering" irrigation
- Temperature and humidity sensors — monitor air conditions for climate control automation
- CO2 sensors — measure PPM levels to control supplemental CO2 systems
Calibration and accuracy
Probe-based meters generally require periodic calibration using pH buffer solutions to maintain accuracy — meters like the Bluelab Truncheon are calibration-free by design, trading some precision for genuine convenience in a busy grow room.
FAQ
Do I need a separate meter for pH and EC, or is there a combined option?
Both exist — combined meters (like some Bluelab models) measure multiple parameters from one probe, while dedicated single-purpose meters can offer more precision for that specific measurement.
How often should sensor probes be replaced?
This varies by probe type and usage intensity, but most probes have a finite working life and gradually lose accuracy over time — if readings seem inconsistent even after calibration, the probe may need replacing.
Can I connect any sensor to any controller?
No — sensor compatibility is generally brand and system-specific (e.g. Trolmaster sensors connect to Trolmaster controllers), so always check compatibility before purchasing.