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The Cultivator HPS Classic glasses restore natural color perception under yellow-spectrum HPS grow lights, reducing glare and eye strain.

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