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GroStar™ GS2




GroStar™ GS2 pH Tester


The GroStar ™ Premium Pen Tester was specially developed for the garden market. GroStar’s intelligent design reduces the guesswork so you can achieve greater success with your harvest


Features of GS2 Premium Soil pH Pen:

  • Measures pH and temperature in nutrient solution, soil, coco coir, rockwool, and many other media types
  • Premium probe technologies and materials ensure high accuracy and durability with minimal maintenance
  • Impact-resistant spear glass tip, 10 times stronger than conventional glass bulb
  • PTFE ring prevents a clogged junction caused by soil particles, significantly increases durability
  • Backed by GroStar proprietary sensor technology from Switzerland
  • Easy to use design and quick calibration setting
  • Replaceable Swiss LabSen Spear Soil pH Probe
  • Large 3-color backlit screen gives you clear information
  • Durable structure, IP67 waterproof rating
  • Powered by AAA batteries with auto-off function
  • Automatic temperature compensation

scope of delivery


  • 1 year guarantee (electrode)
  • pH 7 & pH4 calibration solution (50ml bottle each)
  • KCL storage solution (10ml bottle)
  • Hole Digger
  • Cleaning brush
  • Lanyard and instruction manual

Technical specifications


Area 0,0 to 14,0 pH

0 to 50°C

(32 to 122°F)

resolution 0,1 pH, 0,1°F/0,1°C
accuracy ±0,1 pH,, ±1°C/±1°F
calibration Automatic 1 to 2 point calibration
Temperature compensation Automatically
pH calibration Automatic 1 to 3 points (7/4/10) * pH 10.01 solution sold separately
Unit pH, °F, °C
Backlight Backlight white (measurement); Green (calibration);

Red (error)

Power supply 4 × AAA batteries
IP rating IP67 (waterproof and floatable)
Successful calibration indicators M (7,00 pH), L (4,00 pH), H (10,01 pH)
warranty Two years for the instrument, one year for the electrode
pH-electrode LabSen® Spear Soil pH Probe

operation manual

GS2 Soil pH User Guide v6-E GroStar GS2 Soil pH Pen Tester Brief Manual


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