---
product_id: 748685610
title: "Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml"
brand: "bluelab"
price: "492 DH"
currency: MAD
in_stock: false
reviews_count: 5
url: https://www.desertcart.ma/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7
store_origin: MA
region: Morocco
---

# Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml

**Brand:** bluelab
**Price:** 492 DH
**Availability:** ❌ Out of Stock

## Quick Answers

- **What is this?** Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml by bluelab
- **How much does it cost?** 492 DH with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.ma](https://www.desertcart.ma/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7)

## Best For

- bluelab enthusiasts

## Why This Product

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

## Description

AA

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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B01GQVSQGG |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,079) |
| Date First Available  | March 22, 2017 |
| Is Discontinued By Manufacturer  | No |
| Item model number  | BL-COMBO-1 |
| 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

## Images

![Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml - Image 1](https://m.media-amazon.com/images/I/41Q2n4btDwL.jpg)
![Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml - Image 2](https://m.media-amazon.com/images/I/41QtZ3xd-FL.jpg)
![Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml - Image 3](https://m.media-amazon.com/images/I/51-IqbISXtL.jpg)
![Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml - Image 4](https://m.media-amazon.com/images/I/51ACcJKtTSL.jpg)
![Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml - Image 5](https://m.media-amazon.com/images/I/51G9FhPMULL.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 October 25, 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 July 21, 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 April 9, 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.ma/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7](https://www.desertcart.ma/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7)

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*Product available on Desertcart Morocco*
*Store origin: MA*
*Last updated: 2026-02-15*