Apera GroStar® GS3 EC/ppm Pen Tester (Gen II) — Professional Nutrient Monitoring for Growers
The Apera GroStar GS3 Gen II is a premium EC/ppm pen tester built specifically for growers who need fast, reliable nutrient solution monitoring. Measuring EC, 500 ppm, 700 ppm, and temperature in a single device, the GS3 gives you the complete picture of your nutrient strength — in any grow environment, any lighting condition.
Key Features
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Titanium Conductivity Sensor — Durable, corrosion-resistant titanium probe delivers quick, reliable EC/ppm readings with a long service life in nutrient-rich solutions
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Replaceable Probe Design — When the probe reaches end of life, swap it out — no need to replace the entire pen and protect your investment
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TruRead™ Measurement Mode — Take readings across multiple reservoir zones or plant sites and automatically display average, minimum, and maximum values for comprehensive nutrient mapping
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Dual ppm Scales — Supports both 500 ppm (NaCl) and 700 ppm (KCl) conversion factors to match your preferred nutrient line and feeding chart
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2-Point Automatic Calibration — Simple workflow with electrode condition display for real-time probe health monitoring
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3-Color Backlit LCD — Clear readings in any lighting; color-coded by mode for instant status recognition
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Grower-Optimized Design — Streamlined for daily use in grow rooms, greenhouses, and hydroponic systems
Measurements
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EC (electrical conductivity)
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500 ppm (NaCl conversion)
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700 ppm (KCl conversion)
- Temperature
Applications
Hydroponics, aquaponics, cannabis cultivation, greenhouse growing, nutrient solution monitoring, reservoir management, water treatment, and general EC/TDS testing.
Why GroStar GS3?
Most EC pens lock you into a single ppm scale and force full replacement when the probe ages. The GS3 offers dual ppm scales (500 & 700) for universal compatibility with any nutrient line, plus a replaceable titanium probe that keeps your meter running season after season. Add TruRead™ multi-point averaging and you have the most grower-intelligent EC pen in its class.
