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Time-released 100% organic pellet fertilizer.

The Aptus Indoor Set Basic is an essential fertilizer kit designed to explore concentrated nutrients without the need for large formats.

The Aptus Indoor Set Pro is a complete fertilizer kit designed for testing and discovering a range of concentrated nutrients without the need for large formats.

Everything you need to measure pH, conductivity and temperature

• Handheld design is compact and convenient
• The backlit display is bright and easy to read
• Designed for nutrient reservoirs, the Bluelab pens are waterproof and float in any solution

Bluelab pH Pen

• Measure pH and temperature
• Double-junction probe and simple, 2-point pH calibration with 30-day reminder

Bluelab Conductivity Pen

• Measure conductivity in EC, ppm 500 (TDS) and ppm 700 scales
• Read temperature in C or °F
• Factory calibrated and ready to use out of the box

Durable and waterproof probe ideal for accurate measurements.