--- product_id: 32105900 title: "- pH 4.0 + 7.0 Calibration Solution Kit (500 ml Each)" brand: "bluelab" price: "€ 111.26" currency: EUR in_stock: true category: "Bluelab" url: https://www.desertcart.it/products/32105900-ph-4-0-7-0-calibration-solution-kit-500-ml store_origin: IT region: Italy --- # Long shelf life, ready-to-use Dual pH 4.0 & 7.0 calibration NIST traceable precision - pH 4.0 + 7.0 Calibration Solution Kit (500 ml Each) **Brand:** bluelab **Price:** € 111.26 **Availability:** ✅ In Stock ## Summary > ⚡ Calibrate like a pro, measure like a boss! ## Quick Answers - **What is this?** - pH 4.0 + 7.0 Calibration Solution Kit (500 ml Each) by bluelab - **How much does it cost?** € 111.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.it](https://www.desertcart.it/products/32105900-ph-4-0-7-0-calibration-solution-kit-500-ml) ## 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 - • **Effortless & Ready:** Pre-mixed, ready-to-use solutions save time and eliminate guesswork in calibration. - • **Versatile Application:** Perfect for hydroponics, aquariums, swimming pools, and garden soil monitoring. - • **Dual Calibration Power:** Includes both pH 4.0 and 7.0 buffers to cover a wide range of calibration needs. - • **Precision You Can Trust:** NIST traceable solutions ensure lab-grade accuracy for your pH meters and pens. - • **Extend Your Gear’s Lifespan:** Regular calibration maintains peak performance and prolongs your pH meter’s life. ## Overview The Bluelab pH 4.0 + 7.0 Calibration Solution Kit offers two 500 ml bottles of NIST traceable, ready-to-use pH buffer solutions designed to ensure precise calibration of pH meters and pens. Ideal for professionals managing hydroponics, aquariums, pools, or soil health, this kit extends device longevity and guarantees reliable, accurate pH readings with minimal effort. ## Description Bluelab pH 4.0 + 7.0 Calibration Solution Kit (500 ml Each) | For pH Meters and pH Pens - NIST Traceable: desertcart.com: Industrial & Scientific ## Features - Ensures accurate readings - Our pH calibration solution helps maintain the accuracy and reliability of a pH pen, probe, or tester. Calibration ensures accurate readings. This helps keep the pH level in check for the health of plants, swimmers, or aquatic life. - NIST Traceable - Our pH calibration solutions are NIST traceable and meet the highest quality standards. This set includes two crucial pH levels, pH 4 and pH 7, allowing you to calibrate a wide range of pH instruments. - Improves the longevity of the pH pen or tester - Regular calibration helps extend the life of your pH meters by maintaining their performance. Useful for providing accurate pH in hydroponics, aquariums, swimming pools, or gardens. - Easy-to-use and long shelf life - Our electrolyte solutions are ready-to-use right out of the bottle, saving you time and effort. Our pH calibration solutions don't need frequent replacements as they have a long shelf life. - How to calibrate - Make sure your pH pen or probe is clean and hydrated. Turn it on. Place the probe tip in a fresh pH 7.0 calibration solution. Rinse the pen or probe tip in clean tap water and shake off the excess. Calibrate to pH 4. A calibration confirmation will appear to show a successful calibration. Recalibrate if the symbol disappears. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01GQVSQGG | | Best Sellers Rank | #20,328 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Electrolyte Solutions | | Brand | Bluelab | | Brand Name | Bluelab | | Container Type | Bottle | | Customer Reviews | 4.7 out of 5 stars 1,156 Reviews | | Included Components | One 500ml of ph4 and One 500ml of ph7 | | Item Form | Liquid | | Item Highlight | For pH Meters and pH Pens - NIST Traceable | | Item Volume | 500 ml | | Manufacturer | Bluelab | | Model Number | BL-COMBO-1 | | Molecular Weight | 32.06 | | Molecular weight | 32.06 | | Package Information | Bottle | | Part Number | BL-COMBO-1 | | Unit Count | 2 Count | | Volume | 500 ml | ## Product Details - **Brand:** Bluelab - **Item Form:** Liquid - **Item Volume:** 500 ml - **Molecular weight:** 32.06 - **Package Information:** Bottle ## Images ![- pH 4.0 + 7.0 Calibration Solution Kit (500 ml Each) - 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.it/products/32105900-ph-4-0-7-0-calibration-solution-kit-500-ml](https://www.desertcart.it/products/32105900-ph-4-0-7-0-calibration-solution-kit-500-ml) --- *Product available on Desertcart Italy* *Store origin: IT* *Last updated: 2026-10-22*