• pH Buffer 4 calibration solution 250ml bottle for hydroponics and aquarium water testing, pH meter calibration fluid
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GROWTH TECHNOLOGY pH Buffer 4.0

$9.90
$9.90
Tax included.

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Size
How To Use
  1. Pour enough pH Buffer 4 into a clean container to cover the pH probe.
  2. Place the probe into the solution.
  3. Calibrate the meter according to the manufacturer’s instructions.
  4. Remove the probe and rinse in tap water.
  5. Discard the used pH Buffer 4.
  6. Store your pH meter in a Probe Storage Solution.
Pairs Well With
pH Buffer 4 calibration solution 250ml bottle for hydroponics and aquarium water testing, pH meter calibration fluid

Product Details

pH Buffer 4 – Calibration Solution for pH Meters 🧪

Ensure accurate readings with pH Buffer 4, designed specifically for precise pH meter calibration. For maximum meter accuracy, first calibrate using pH Buffer 7, then follow with pH Buffer 4.

🎯 Why use pH Buffer 4?

  • ✅ Expertly calibrates your pH meters
  • 📏 Ensures precise and reliable pH measurements
  • 🔁 Maintains consistent results over time — even as your meter ages
  • 🔍 Confirms meter performance and helps detect drift or inaccuracies

Using known reference points during calibration helps protect the accuracy of your nutrient solution measurements in hydroponic systems.

📝 How to use

  1. Pour enough pH Buffer 4 into a clean container to cover the pH probe
  2. Place the probe into the solution
  3. Calibrate the meter according to the manufacturer's instructions
  4. Remove the probe and rinse in tap water
  5. Discard the used pH Buffer 4
  6. Store your pH meter in Probe Storage Solution

📦 Storage instructions

  • Store in a cool, dark place

FAQ

Q. What is PH BUFFER 4 used for?

PH BUFFER 4 is used to calibrate pH meters, ensuring precise and reliable pH measurements.

Q. Should I use PH BUFFER 7 before PH BUFFER 4?

Yes. For maximum meter accuracy, first calibrate with PH BUFFER 7 and then use PH BUFFER 4.

Q. Why is regular calibration important?

Regular calibration helps maintain consistent measurement results over time and confirms the meter’s performance by detecting drift or inaccuracies.

Q. How should I store PH BUFFER 4?

Store PH BUFFER 4 in a cool, dark place.

Warranty & Returns

Please choose your products carefully, as A-Grade Hydroponics reserves the right not to accept returns based on either an incorrect choice or a change of mind.

However, we love happy customers so contact us with your query and we will do our best to accommodate you. If you have queries about a product you would like to purchase, please contact us to discuss your concerns before you buy.

A-Grade Hydroponics will honour all manufacturers warranties subject to the terms and conditions of those manufacturers. However warranty does not cover abuse, neglect, improper care, loss or damage from incorrect usage.

Warranty claims will be processed at A-Grade Hydroponics' discretion as a refund, repair or replacement. If products need to be returned to us for warranty purposes e-mail us at grow@agradehydroponics.com with the receipt/invoice number, date of purchase and a brief description of the fault (including photographs where possible). We will then issue you with a product return number.

All returns should be in original packaging and have the receipt/invoice number, date of purchase, and product return number enclosed. The product return number should also be written on the outside of the package for easy identification purposes.

A-Grade Hydroponics has a strict 'no returns' or refunds policy for liquid products, like nutrients, additives, gels, calibration fluids etc, so please choose these items carefully.

Shipping & Delivery

*All orders are dispatched in unmarked boxes to maintain your privacy.*

DISPATCH AND DELIVERY

Orders are shipped via Australia Post or shipping platform Big Post. Orders are generally dispatched on Tuesday, Wednesday and Friday. Please allow for additional delivery time for remote areas. If you require express delivery, please contact our sales representatives at 03 9555 6667 or email grow@agradehydroponics.com to obtain a quote. 

Couriers will attempt delivery to the specified address. If no one is home to receive the delivery, the couriers will leave your parcel somewhere safe. If there is no safe place, re-delivery or collection will be offered by the carrier.

Due to the increasing frequency of online fraud and theft, we are unable to ship to P.O. Boxes and Parcel Lockers.

SHIPPING COSTS

All freight charges are calculated on weight, dimensions and location. We are committed to keeping shipping charges at a minimum and do not charge handling fees.

Please note: Freight costs are subject to change. Regional areas, large and bulky orders, and tail-lift delivery occasionally incur an additional levy. Should shipping costs need to be amended it will be to reflect the actual charges, and not incur additional ‘shipping and handling’ fees. We will notify you if this rare situation occurs.

A-Grade Hydroponics reserves the right to cancel the order if shipping costs become prohibitive and customers will be issued a full refund.

PAYMENT

All payments must be cleared before dispatch. Payments can be made online via PayPal, AfterPay, PayID or Electronic Funds Transfer. Payments can also be accepted via credit card by phoning 03 9555 6667.

Please allow at least 24 hours for payments to clear.

FULFILMENT OF ORDERS

You will be notified immediately if an item is permanently unavailable, with options for a replacement item at equal or higher value, refund or store credit.

All refunds will clear within 3-5 business days. Store Credits will be issued as an electronic Gift Card to be used online or in-store.

DANGEROUS AND PROHIBITED GOODS

These goods are available for in-store collection only.