---
product_id: 712457668
title: "pH 4.0 & 7.0 Calibration Solution (500ml)"
brand: "bluelab"
price: "KD 32.00"
currency: KWD
in_stock: true
reviews_count: 5
category: "Bluelab"
url: https://www.desertcart.com.kw/products/712457668-ph-4-0-and-7-0-calibration-solution-500ml
store_origin: KW
region: Kuwait
---

# 500ml long-lasting supply Dual pH calibration (4.0 & 7.0) Lab-grade precision pH 4.0 & 7.0 Calibration Solution (500ml)

**Brand:** bluelab
**Price:** KD 32.00
**Availability:** ✅ In Stock

## Summary

> ⚡ Calibrate like a pro, grow like a legend!

## Quick Answers

- **What is this?** pH 4.0 & 7.0 Calibration Solution (500ml) by bluelab
- **How much does it cost?** KD 32.00 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/712457668-ph-4-0-and-7-0-calibration-solution-500ml)

## Best For

- bluelab enthusiasts

## Why This Product

- Trusted bluelab brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Extended Supply:** Generous 500ml bottle designed to last through years of monthly calibrations, saving you time and money.
- • **Lab-Grade Accuracy:** Ensure your pH meter delivers precise, reliable readings every time with solutions referenced to high laboratory standards.
- • **Trusted by Growers:** Join a community of hydroponic professionals who rely on Bluelab solutions to boost their crop quality and confidence.
- • **Optimized Probe Care:** Maintain your Bluelab Conductivity/Temperature probe’s cleanliness and longevity with dedicated calibration and cleaning solutions.
- • **Dual-Point Calibration:** Calibrate both acidic (pH 4.0) and neutral (pH 7.0) points for flawless measurement accuracy tailored to your grow environment.

## Overview

The Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) is a premium, lab-standard liquid designed specifically for Bluelab pH meters. It ensures precise dual-point calibration, extends the lifespan of your probes, and supports consistent, accurate readings essential for professional hydroponic and plant growth management.

## Description

Calibration and conductivity standard solutions. a must in every grower's toolbox. The Bluelab calibration and conductivity standard solutions are essential for use with all Bluelab products for the calibration of pH and testing the cleanliness of the Bluelab Conductivity/Temperature probe. Bluelab solutions are manufactured specifically for Bluelab products and are referenced to high laboratory standards to ensure your Bluelab products last longer and maintain accuracy. Bluelab EC/CF equipment does not need calibrating as they are all factory calibrated here at Bluelab. The CF27.7 (EC2.77) solution is used as a reference or checking solution to ensure you have adequately cleaned the EC/CF probe. Contamination between solutions can easily occur, which will affect the validity of the calibration. Bluelab recommend that the solutions are de-cantered into a smaller vessel and the contents discarded when the calibration process has been completed.

Review: I followed the directions to the letter and the calibration solutions worked perfectly. I feel so much better about my grow knowing the reading I am getting are true readings. The solution hand my Blue Labs OnePen with perfectly calibrated and fast results
Review: I own the blue lab ph pen and EC meter, and these solutions are perfect for calibration of the pH pen. I bought large bottles, still working super well a year later, probably have enough to last me another 3 years of regular monthly calibration checks/calibrations. Between the nice test pen and these solutions my hydroponic results have improved. Good stuff.

## Features

- plant

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01GQVSQGG |
| Item model number | BL-COMBO-1 |
| Manufacturer | Bluelab |
| Package Dimensions | 18.49 x 14.1 x 7.01 cm; 1.03 kg |

## Product Details

- **Brand:** Bluelab
- **Item form:** Liquid
- **Item volume:** 500 Milliliters
- **Manufacturer:** Bluelab
- **Package information:** Bottle

## Images

![pH 4.0 & 7.0 Calibration Solution (500ml) - Image 1](https://m.media-amazon.com/images/I/71+ybs4c1zL.jpg)

## Questions & Answers

**Q: Can you reuse solutions?**
A: Yes a couple of times but I wouldn’t pour it back in the bottle if you’ve used it already. For example I have 3 ph meters so I’ll put some of each in a cup and use the same solution to calibrate all 3 of my ph meters then toss the solution. The bottles last a long time though.

**Q: The bottle doesn’t specify how much solution to add to how much water to make the ph 7.0 and 4.0 solutions. It just says add the required amount???**
A: You don't add anything its pre made to the ph level.

**Q: Can i use this solution for other brand ph meters ? i own a adwa ph meter, or is this only for bluelab products ?**
A: It will work for all PH meters.

**Q: How often would I expect to run out of solution? I would hope for $45.00 this would last a t least a year.**
A: I believe it will last a year I Calibrate my pen whenever it goes out of calibration which is usually about once a month

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by M***J on 25 October 2024*

I followed the directions to the letter and the calibration solutions worked perfectly. I feel so much better about my grow knowing the reading I am getting are true readings. The solution hand my Blue Labs OnePen with perfectly calibrated and fast results

### ⭐⭐⭐⭐⭐ Review
*by R***A on 21 July 2023*

I own the blue lab ph pen and EC meter, and these solutions are perfect for calibration of the pH pen. I bought large bottles, still working super well a year later, probably have enough to last me another 3 years of regular monthly calibration checks/calibrations. Between the nice test pen and these solutions my hydroponic results have improved. Good stuff.

### ⭐⭐⭐⭐⭐ Review
*by M***G on 9 April 2025*

Fast delivery, quality products

## Frequently Bought Together

- Bluelab pH 4.0 & 7.0 Calibration Solution Kit - pH Meter & pH Pen Calibration for Balanced Nutrient Solution NIST Traceable | Hydroponics, Gardening & Growing Tents (500 ml/ 16.9 Fl Oz Each)
- Bluelab STSOL120 KCL Storage Solution 120ml pH Probe and Pen, Maintain Meters Used for Water, Soil, and Hydroponic System or Indoor Plant Grow White

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**Shop now:** [https://www.desertcart.com.kw/products/712457668-ph-4-0-and-7-0-calibration-solution-500ml](https://www.desertcart.com.kw/products/712457668-ph-4-0-and-7-0-calibration-solution-500ml)

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*Product available on Desertcart Kuwait*
*Store origin: KW*
*Last updated: 2026-02-21*