Apera Instruments GroStar GS1 pH Pen Tester (Gen II)

Get fast, accurate pH readings.

Apera Instruments GroStar GS1 pH Pen Tester (Gen II) is a lab-grade pH meter designed specifically for growers to easily manage crop success, featuring a durable and accurate replaceable sensor and a grower-friendly workflow along with other intelligent functions and features that help reduce the guesswork and give you the confidence in every measurement.

State-of-the-art pH sensor tech 

• The GroStar pH probe is featured with a anti-contamination double-junction reference system and blue gel inner electrolyte along with a lithium glass membrane, allowing you to easily take accurate pH measurement in the long term.
• The probe is replaceable just so you only need to replace the probe when it reaches its end of life instead of buying a whole new tester.

3-color backlit HD display

• White for measurement mode
• Green for calibration mode
• Red for calibration error

Durable Structure

IP67 waterproof and dust-proof rating allows you to use in harsh environment. 

Complete Test Kit

The pen comes with a complete set of all the necessary accessories for you to take reliable pH and EC measurement. 

Specifications:

Range - 0 to 14.0 pH, 0 to 50˚C (32 to 122˚F)

Resolution - 0.1 pH, 0.1˚C/0.1˚F

Accuracy - ±0.1 pH, ±1˚C/±1˚F

Temperature Compensation - Automatic 0 to 50˚C (32 to 122˚F)

Calibration - pH: Automatic 1 to 3 points (4/7/10)

Unit - pH, ˚C, ˚F

Power Supply - 4 AAA alkaline batteries

Backlight - White (measurement) ; Green (calibration) ; Red (error reminder) Waterproof Rating - IP67

pH Probe - Low-impedance lithium glass membrane; double-Junction; Blue inner gel electrolyte

As a rule of thumb, we recommend calibrating your tester once every 2 weeks. And you can check the accuracy of your tester anytime by simply testing the standard solution and compare the result to the standard value.