--- product_id: 712457668 title: "Bluelab pH 4.0 & 7.0 Calibration Solution (500ml)" brand: "bluelab" price: "€ 143.14" currency: EUR in_stock: true reviews_count: 5 category: "Bluelab" url: https://www.desertcart.at/products/712457668-bluelab-ph-4-0-and-7-0-calibration-solution-500ml store_origin: AT region: Austria --- # 500ml long-lasting supply Dual pH calibration (4.0 & 7.0) Lab-grade accuracy Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) **Brand:** bluelab **Price:** € 143.14 **Availability:** ✅ In Stock ## Summary > 🧪 Elevate your grow game with precision calibration solutions that keep you ahead of the curve! ## Quick Answers - **What is this?** Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) by bluelab - **How much does it cost?** € 143.14 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/712457668-bluelab-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 - • **Dual-Point Calibration:** Ensure spot-on readings with both pH 4.0 and 7.0 solutions tailored for professional growers. - • **Precision You Can Trust:** Calibrate your Bluelab devices with lab-referenced solutions for flawless pH accuracy every time. - • **Bulk Supply for Consistency:** 500ml bottle designed to last through multiple calibrations, keeping your grow on point. - • **Extend Your Equipment's Life:** Maintain probe cleanliness and accuracy, preventing costly misreads and equipment wear. - • **Exclusive Bluelab Compatibility:** Formulated specifically for Bluelab products, guaranteeing seamless integration and peak performance. ## Overview The Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) is a premium, lab-standard liquid designed exclusively for calibrating Bluelab pH meters. It ensures accurate, reliable readings by providing dual-point calibration, essential for professional growers who demand precision. The 500ml bottle offers long-lasting use, helping maintain probe cleanliness and extending device lifespan. ## 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: Perfect - 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: When it has to be spot on - Can’t beat Blue lab products ## Features - plant ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01GQVSQGG | | Brand | Bluelab | | Brand Name | Bluelab | | Container Type | Bottle | | Customer Reviews | 4.7 out of 5 stars 1,099 Reviews | | Item Form | Liquid | | Item form | Liquid | | Item volume | 500 Milliliters | | Manufacturer | Bluelab | | Model Number | BL-COMBO-1 | | Package information | Bottle | | Part Number | BL-COMBO-1 | | Volume | 500 Milliliters | ## Product Details - **Brand:** Bluelab - **Item form:** Liquid - **Item volume:** 500 Milliliters - **Manufacturer:** Bluelab - **Package information:** Bottle ## Images ![Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) - Image 1](https://m.media-amazon.com/images/I/71+ybs4c1zL.jpg) ![Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) - Image 2](https://m.media-amazon.com/images/I/81NUbdvbRvL.jpg) ![Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) - Image 3](https://m.media-amazon.com/images/I/71cECoRsBvL.jpg) ![Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) - Image 4](https://m.media-amazon.com/images/I/71TK+BAnLkL.jpg) ![Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) - Image 5](https://m.media-amazon.com/images/I/71+hTpjABLL.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 ### ⭐⭐⭐⭐⭐ Perfect *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 ### ⭐⭐⭐⭐⭐ When it has to be spot on *by J***N on 4 July 2026* Can’t beat Blue lab products ### ⭐⭐⭐⭐⭐ Good *by S***N on 10 March 2026* Good ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.at/products/712457668-bluelab-ph-4-0-and-7-0-calibration-solution-500ml](https://www.desertcart.at/products/712457668-bluelab-ph-4-0-and-7-0-calibration-solution-500ml) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-08-22*