---
product_id: 158441260
title: "Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml"
brand: "bluelab"
price: "116 kr"
currency: DKK
in_stock: true
reviews_count: 5
url: https://www.desertcart.dk/products/158441260-bluelab-ph-4-0-calibration-solution-500-ml-ph-7
store_origin: DK
region: Denmark
---

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

**Brand:** bluelab
**Price:** 116 kr
**Availability:** ✅ In 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?** 116 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/158441260-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

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's 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01GQVSQGG |
| Batteries Required? | No |
| Batteries included? | No |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,079) |
| Date First Available | 7 Jun. 2016 |
| Item Package Quantity | 1 |
| Item Weight | 1.03 kg |
| Item model number | BL-COMBO-1 |
| Manufacturer | SCOBUTY |
| Package Dimensions | 18.49 x 14.1 x 7.01 cm; 1.03 kg |
| Part number | BL-COMBO-1 |

## Product Details

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

## 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 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.dk/products/158441260-bluelab-ph-4-0-calibration-solution-500-ml-ph-7](https://www.desertcart.dk/products/158441260-bluelab-ph-4-0-calibration-solution-500-ml-ph-7)

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*Product available on Desertcart Denmark*
*Store origin: DK*
*Last updated: 2026-02-27*