GroStar® GS4-P 6-in-1 Combo Pen Tester (Gen II) – Advanced Nutrient & Water Quality Monitoring for Growers

For growers who demand precision, reliability, and efficiency, the GroStar® GS4-P 6-in-1 Combo Pen Tester (Gen II) is the ultimate tool for monitoring pH, EC, 500ppm, 700ppm, ORP, and temperature in hydroponic systems, soil-based cultivation, and greenhouse environments. Whether you’re optimizing nutrient absorption, balancing EC levels, or ensuring effective water treatment, this tester eliminates guesswork and puts lab-grade accuracy at your fingertips, helping you maximize plant health and boost yields effortlessly.

Why Choose GroStar® GS4-P?

The GS4-P isn’t just a tester—it’s a comprehensive solution designed for growers who take their results seriously. Equipped with a Swiss-engineered double-junction pH sensor and a titanium conductivity probe, this meter delivers ultra-fast, stable readings, ensuring long-term durability even in challenging conditions. The integrated ORP probe gives growers critical insights into water quality and oxidation-reduction potential, helping them monitor disinfection levels, nutrient uptake, and microbial activity for a healthier growing environment.

Precision & Long-Term Reliability

• Swiss Double-Junction pH Sensor – Provides high-precision pH readings while minimizing contamination for extended lifespan.

• Titanium Conductivity Sensor – Ensures fast, stable EC and ppm measurements with superior resistance to corrosion and environmental conditions.

• Integrated ORP Probe – Allows oxidation-reduction potential monitoring, making it an essential tool for water treatment, disinfection, and nutrient balance.

• TruRead Measurement Mode – Automatically collects multiple readings, displaying average, minimum, and maximum values for deeper analysis and more reliable results.

Designed for Effortless Calibration & User-Friendly Operation

• Quick 2-Point Automatic Calibration – Ensures seamless, stress-free calibration, so you get precise results every time.

• Electrode Condition Display – Lets you know when recalibration is needed, ensuring consistency and reliability in every reading.

• 3-Color Backlit LCD Screen – Provides instant readability in bright, dim, or dark environments, making testing easy under any conditions.

• Replaceable Probe Design – Saves costs, allowing simple probe replacements without discarding the entire device for long-term usability.

Durability Meets Practicality

• Waterproof & Impact-Resistant Construction – Designed for harsh field conditions, greenhouse environments, and hydroponic setups.

• Compact & Portable Design – Easy to carry, ensuring effortless testing in multiple locations.

• Built for Growers Who Demand Results – Perfect for hydroponics, greenhouse cultivation, commercial farming, and research applications.

Boost Your Yield with Unmatched Accuracy & Convenience

From nutrient balance to water quality monitoring, the GroStar® GS4-P 6-in-1 Combo Pen Tester (Gen II) gives you lab-grade precision in an intuitive, easy-to-use package. Used by growers, hydroponic experts, and agricultural researchers, this tester ensures that every measurement counts toward healthier plants and bigger yields.

Stop guessing—start growing smarter. Get your GroStar® GS4-P today