Bluelab Conductivity Pen | EC, PPM & Temperature Meter

Never Guess Your Nutrient Levels Again

Overfeeding or underfeeding your plants is one of the most common — and costly — mistakes in hydroponics. The Bluelab Conductivity Pen gives you instant, accurate EC and temperature readings so you can dial in the perfect nutrient environment every single time.

Whether you're growing leafy greens, herbs, or high-value crops, this pocket-sized pen helps you catch problems before they become expensive ones.

Why Growers Choose the Bluelab Conductivity Pen

• ✅ Instant, accurate readings — factory calibrated and ready to use right out of the box
• ✅ Automatic Temperature Compensation (ATC) — ensures EC readings are always accurate regardless of solution temperature
• ✅ Measures EC, ppm 500 (TDS) & ppm 700 — choose the unit that suits your growing style
• ✅ Reads temperature in °C or °F — monitor solution temp to protect root health
• ✅ Bright backlit display — easy to read in any grow room lighting
• ✅ Waterproof & floats — built tough for real growing environments
• ✅ Compact handheld design — fits in your pocket, goes wherever you grow

Complete Your Measurement System

Pair the Conductivity Pen with the Bluelab pH Pen to also monitor pH levels — giving you full control over both nutrient availability and uptake. Together, they form the essential toolkit for any serious grower.

Specifications

• EC Range: 0.0 – 10.0 | Resolution: 0.1 | Accuracy: ±0.1
• ppm 500 (TDS): 0 – 5000 | Resolution: 10 | Accuracy: ±50
• ppm 700: 0 – 7000 | Resolution: 10 | Accuracy: ±70
• Temperature (°C): 0 – 50°C | Accuracy: ±1°C
• Temperature (°F): 32 – 122°F | Accuracy: ±2°F
• Power: 1x AAA alkaline battery
• Warranty: 1-year limited warranty
• Box Contents: 1x Bluelab Conductivity Pen

Understanding EC & Why It Matters

Electrical conductivity (EC) measures the total dissolved nutrients (salts) in your solution. When nutrients are added to water, they create the potential for electricity to flow — the higher the EC, the more nutrients are present. Monitoring EC regularly ensures your plants are getting exactly what they need to thrive, without the risk of nutrient burn or deficiency.

Solution temperature is equally critical — water that's too hot or too cold directly impacts nutrient uptake and root health. The Bluelab Conductivity Pen measures both, so you're always in control.