Ensure precise and reliable pH measurements with the GT pH Calibration Kit, featuring Buffer 4 and Buffer 7 solutions. Designed for use with pH meters and testers, this kit is essential for hydroponics, agriculture, water quality testing, and laboratory applications.
Accurate pH calibration is critical because plant mineral absorption depends on nutrient solution pH. If the pH falls outside the optimal range of 5.5–6.5, even the best nutrient solutions won’t be fully effective, leading to deficiencies and stunted growth.
 
Why Use Buffer 4 & 7?
Buffer 4: Calibrates the lower (acidic) end of the pH scale.
Buffer 7: Calibrates neutral pH for general accuracy.
Formulated with high-quality ingredients to provide stable, reliable reference points.
Detects if your pH meter is off — if the meter doesn’t read 4 or 7 in these solutions, it needs recalibration.
 
Key Benefits
Ensures accurate pH readings for hydroponics and nutrient solutions.
Helps prevent mineral deficiencies caused by incorrect pH.
Easy-to-use solution bottles with simple calibration instructions.
Safe and precise for both professional and home growers.
 
Usage Tips
Pour enough buffer to cover the glass end of the pH probe.
Calibrate your meter according to the included instructions.
Discard used buffer after each calibration — do not return it to the bottle.
Check pH 7 buffer weekly and pH 4 buffer monthly to ensure meter accuracy.
Monitor pH daily if using a recirculating hydroponic system.
 
Applications
Hydroponic nutrient solutions
Greenhouse and indoor agriculture
Water quality testing
Laboratory pH analysis