--- product_id: 712457668 title: "Bluelab pH 4.0 & 7.0 Calibration Solution (500ml)" brand: "bluelab" price: "€ 138.57" currency: EUR in_stock: true category: "Bluelab" url: https://www.desertcart.at/products/712457668-bluelab-ph-4-0-and-7-0-calibration-solution-500ml store_origin: AT region: Austria --- # Essential for optimal plant growth monitoring Lab-grade solution for unmatched accuracy Precise pH calibration at 4.0 & 7.0 Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) **Brand:** bluelab **Price:** € 138.57 **Availability:** ✅ In Stock ## Summary > ⚗️ Stay calibrated, stay ahead – precision that cultivates success! ## Quick Answers - **What is this?** Bluelab pH 4.0 & 7.0 Calibration Solution (500ml) by bluelab - **How much does it cost?** € 138.57 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 - • **Lab-Standard Purity:** Manufactured to rigorous laboratory standards ensuring your Bluelab devices deliver consistent, reliable readings. - • **Contamination Control:** Designed for easy decanting to prevent cross-contamination, preserving the integrity of your calibration process. - • **Extend Device Lifespan:** Regular calibration with these solutions keeps your Bluelab probes accurate and durable, saving you replacement costs. - • **Trusted by Professionals:** Over 1,000 five-star reviews prove this is the go-to calibration solution for serious growers and lab technicians alike. - • **Dual pH Calibration Power:** Calibrate your pH meter at both acidic (4.0) and neutral (7.0) points for flawless accuracy every time. ## Overview Bluelab's pH 4.0 & 7.0 Calibration Solution (500ml) is a premium, lab-grade liquid designed specifically for calibrating Bluelab pH meters. It ensures precise, reliable readings essential for plant health monitoring and probe longevity. Trusted by over a thousand professionals, this solution prevents contamination and maintains device accuracy, making it an indispensable tool for growers and lab users. ## 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. ## Features - plant ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01GQVSQGG | | Brand Name | Bluelab | | Container Type | Bottle | | Customer Reviews | 4.7 4.7 out of 5 stars (1,092) | | Item Form | Liquid | | Manufacturer | Bluelab | | Model Number | BL-COMBO-1 | | 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) ## 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 ## 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: 2026-07-17*