Skip to content

GH pH 4.01 Calibration Solution




General Hydroponics’ pH 4.01 Calibration Solution is a high quality solution that allows growers to calibrate many popular brands of pH, EC, and TDS meters. By Simply dipping the probe in a small amount of the balanced solution, adjust (calibrate) the meter to read 4.01 and you are ready to go.

  • Quality tested regularly to ensure accurate readings

Your Garden's Success is our #1 Priority

HTG Supply is committed to providing you with the very best products, pricing and service in the industry. We will ship your order fast and discreetly packaged to protect your privacy. Buy with confidence knowing your HTG Supply purchase includes simple returns as well as lifetime product support. Call our team of real growing experts with your purchasing or product use questions, and we will be here to help!

See it for less somewhere else? Give us a call and we’ll beat any online competitor’s price!

Customer Service:  1-866-710-GROW (4769) | | Hours: Mon-Fri 9:00 a.m. to 5:00 p.m.


Solutions to calibrate your monitoring instruments.
pH 4.01, pH 7.0, 1500PPM
General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used.



There are no reviews yet.

Only logged in customers who have purchased this product may leave a review.