Apera Instruments GroStar® GS1 pH Pen Tester (Gen II) – Precision for Growers Who Demand Results

Take full control of your crop success with the Apera GroStar® GS1 pH Pen Tester (Gen II)—designed to deliver fast, accurate, and reliable pH measurements without the guesswork. Featuring Swiss sensor technology, a double-junction reference system, and blue gel inner solution, this premium tester ensures long-lasting precision while eliminating common measurement errors.

Optimized for Growers Who Need Accuracy & Convenience

• Double-Junction Reference System – Provides stable measurements, resists contamination, and extends electrode lifespan.

• Blue Gel Inner Solution – Speeds up response time, ensuring rapid, reliable pH readings in various grow mediums.

• Replaceable Probe – Maximizes tester longevity, so you replace only the probe—not the entire pen.

Designed for Hassle-Free pH Management

• Quick 2-Point Automatic Calibration – Calibrate in seconds and check your electrode condition at a glance.

• 3-Color Backlit LCD Screen – View readings clearly in any environment, even in low-light grow rooms.

• TruRead Measurement Mode – Automatically captures multiple readings, displaying average, minimum, and maximum values for precise monitoring.

Built to Last – Durable & Easy to Use

• Waterproof, Impact-Resistant Body – Designed for long-term durability in greenhouse and field conditions.

• Intuitive Workflow – Straightforward setup, fast calibration, and simple operation for effortless pH management.

Trusted by Growers for Maximum Crop Health & Yield

Used by hydroponic farmers, greenhouse growers, and agricultural professionals, the Apera GroStar® GS1 pH Pen delivers precision, reliability, and ease of use, making it an essential tool for growers who demand accuracy