--- product_id: 748685610 title: "Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml" brand: "bluelab" price: "S/.201" currency: PEN in_stock: false reviews_count: 5 url: https://www.desertcart.pe/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7 store_origin: PE region: Peru --- # Bluelab pH 4.0 Calibration Solution 500 ml, pH 7.0 Calibration Solution 500 ml **Brand:** bluelab **Price:** S/.201 **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?** S/.201 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pe](https://www.desertcart.pe/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 --- ## 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.pe/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7](https://www.desertcart.pe/products/748685610-bluelab-ph-4-0-calibration-solution-500-ml-ph-7) --- *Product available on Desertcart Peru* *Store origin: PE* *Last updated: 2026-06-05*