Lab-Grade Instruments Designed Specifically For Growers Lab-Grade Instruments Designed Specifically For Growers
Thank you for choosing the Apera GroStar™ GS4 Premium pH EC Pen Tester. This premium pen has been designed
specifically for the horticultural market. Since 1991, Apera instruments has been dedicated to providing hi-tech,
accurate, lab-grade instruments and sensors. GroStar's intelligent design reduces the guesswork so you can easily
manage your crops success.
• Premium combo pH/EC probe measures pH, EC, ppm (500/700) all-in-one unit with minimal maintenance.
• Easy to use design and quick two point calibration adjustment.
• 3-Color backlit LCD screen gives you clear readings in different modes even in dark enviroment.
• Durable structure, IP67 waterproof rating, powered by AAA batteries.
• The probe is replaceable, so you don't have to discard the entire pen when the probe reaches its end of life.
3-Color LCD Screen
stands for stabilized reading
Probe Cap
L/M/H stands for successful
calibration: L is pH 4, M is pH 7 or
2.77 EC, H is pH 10. The icon(s) will
disappear after 30 days to remind
you for re-calibration.
• Water droplets are added
during production to maintain
the moisture of the probe. This
is normal practice and should
not be attributed to used
product.
• The fill line shows the level
to which you should pour the
soaking solution or sample
solution.
• For details of probe storage, see
Section 9.
Short Press Long Press
1. Power on
2. Manual hold
Press again to cancel hold.
In measurement mode,
press to turn on/off the
backlight.
Switch mode:
pH→EC→500ppm
→700ppm
Power off
Start
calibration
Switch
between
°F and °C
Sensor Shield
Protects the sensitive pH glass membrane from
accidental damage. Remove it when cleaning
the pH sensor.
Premium pH • EC Combo Probe
• Upgraded double-junction blue pH sensor,
increased durability and easier to use.
• Titanium alloy conductivity sensor, highly
accurate and requires minimal maintenance
• The probe is replaceable, saving money in the
long run.
2.1 Pull out the battery insulation slip, and take off the probe cap.
2.2 Rinse off the probe in clean water, then shake off excess water.
2.3 Calibrate pH and EC. For calibration tutorial, refer to Section 3 and Section 4.
01
02
2.4 If you find the probe cap is dried out, soak the probe in 3M KCL soaking solution
for 5 minutes before use.
2.5 If the tester hasn’t been used for a long time (over 1 month), please soak the
probe in the 3M KCL soaking solution for at least 1 hour, then calibrate it before
measurement begins.
02 03
Main Features
Preparation Before First Use
• White for measurement mode
• Green for calibration mode
• Red for calibration error
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