--- product_id: 34656360 title: "pH Buffer Calibration Solution 3-Pack: pH 4.00 Buffer, pH 7.00 Buffer, and Electrode Storage Solution — 250 mL (8.4 fl oz) Each — NIST Traceable Reference Standards for All pH Meters" brand: "biopharm" price: "227.35 DT" currency: TND in_stock: true reviews_count: 8 category: "Biopharm" url: https://www.desertcart.tn/products/34656360-ph-buffer-calibration-solution-3-pack-ph-4-00-buffer store_origin: TN region: Tunisia --- # color-coded bottles for quick ID 3 precise pH calibration buffers NIST-traceable with lot & expiry pH Buffer Calibration Solution 3-Pack: pH 4.00 Buffer, pH 7.00 Buffer, and Electrode Storage Solution — 250 mL (8.4 fl oz) Each — NIST Traceable Reference Standards for All pH Meters **Brand:** biopharm **Price:** 227.35 DT **Availability:** ✅ In Stock ## Summary > 🧪 Calibrate with Confidence, Measure with Mastery ## Quick Answers - **What is this?** pH Buffer Calibration Solution 3-Pack: pH 4.00 Buffer, pH 7.00 Buffer, and Electrode Storage Solution — 250 mL (8.4 fl oz) Each — NIST Traceable Reference Standards for All pH Meters by biopharm - **How much does it cost?** 227.35 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/34656360-ph-buffer-calibration-solution-3-pack-ph-4-00-buffer) ## Best For - biopharm enthusiasts ## Why This Product - Trusted biopharm brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Color-Coded Convenience:** Quickly identify pH 4.00, pH 7.00, and electrode storage solutions with intuitive color coding—no mix-ups, no delays. - • **Electrode Care Included:** The included storage solution prolongs electrode life by keeping it clean and protected—saving you time and replacement costs. - • **Ready-to-Use 250 mL Bottles:** Generous volume in individually sealed poly bottles means you’re always stocked and ready for critical measurements. - • **Certified Quality & Traceability:** Each batch comes with a free Certificate of Analysis, lot number, and expiration date for full lab compliance and confidence. - • **Precision-Calibrated for Accuracy:** NIST-traceable standards ensure your pH meter delivers lab-grade precision every time. ## Overview This 3-pack pH buffer calibration solution set includes pH 4.00, pH 7.00, and electrode storage solutions in 250 mL color-coded bottles. Manufactured in the USA and standardized against NIST reference materials, each lot is traceable with a certificate of analysis, lot number, and expiration date. Ideal for pharmaceutical, academic, research, and industrial labs, it ensures precise pH meter calibration and electrode maintenance for reliable, repeatable results. ## Description These buffer calibration solutions are suitable for the calibration of all pH meters. Each production lot is manufactured in our USA laboratory following carefully controlled written procedures and standardized against NIST standard reference materials (SRM) for highest accuracy. The finished product is assigned a unique Lot number and expiration date. These products will have greater than one year shelf life when received. The electrode storage solution will help keep the pH electrode clean and protected. Review: Works great. Better alternative to more expensive brands. - Great product. Will buy again. Accurate and high volume for the price. Review: Will buy more for sure! ⭐️⭐️⭐️⭐️⭐️ - I love it! ## Features - Color Coded for Easy Identification - Individually Bagged 250 ml (8.4 fl oz) Poly Bottles - Lot Numbered and Expiration Dated - Free Certificate of Analysis and Traceability - For Pharmaceutical, Academic, Research and Industrial Labs ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01LVU36UD | | Best Sellers Rank | #352,556 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #178 in Chemical Buffers | | Brand Name | Biopharm | | Container Type | Bottle | | Customer Reviews | 4.7 4.7 out of 5 stars (329) | | Item Form | Liquid | | Item Weight | 2.05 Pounds | | Manufacturer | Biopharm Inc | | UPC | 721272377187 | | Volume | 250 Milliliters | ## Product Details - **Brand:** Biopharm - **Item Form:** Liquid - **Item Volume:** 250 Milliliters - **Item Weight:** 2.05 Pounds - **Package Information:** Bottle ## Images ![pH Buffer Calibration Solution 3-Pack: pH 4.00 Buffer, pH 7.00 Buffer, and Electrode Storage Solution — 250 mL (8.4 fl oz) Each — NIST Traceable Reference Standards for All pH Meters - Image 1](https://m.media-amazon.com/images/I/71QPru9ZomL.jpg) ## Questions & Answers **Q: how many times can you calibrate with one bottle?** A: If you're using a combination pH electrode rinse the electrode well with distilled water to remove storage solution or whatever the electrode was previously in. Then rinse the electrode with a small amount (about 25 ml) of the buffer. Throw away the rinse and add fresh buffer to cover the electrode well (25 to 50ml, depending upon how big your electrode is ). If you're using a separate reference electrode you may need a larger volume to cover both electrodes well. Swirl the electrode(s) in the buffer and let the reading stabilize. Normally you start with pH 7 and set that calibration point then repeat the process using pH 4 and use the "slope" adjustment to set this point. Do not pour the used buffer back into the buffer bottle; throw it away. You risk contaminating your reference standard by trying to reuse it. Depending upon the size of your electrode(s) you may need 50 ml to 100 ml each time to do a good calibration. So the shorter answer is probably 3 to 5 calibrations per 8 oz bottle. It is good practice to calibrate the same day you are measuring your sample(s) because the meter/electrode settings can "drift" out of calibration. If you do pH measurements often you may want to buy the 500 ml (pint) size calibration kit. **Q: I use the storage solution for my hm digital ph tester and I later get salt deposits on the lid, is this storage solution ok for this electrode?** A: Yes it is OK. Because the storage solution has a lot of potassium chloride dissolved in it crystals will form where the water has evaporated away. You can wipe them away with a damp paper towel or simple ignore them. They will not cause any problem. **Q: I have a hm digital ph tester, how do i use the 4.0, 7.0 calibration solutions? do i dilute it or use it as is?** A: Do not dilute it. Pour a small amount (approx. 50 ml) into a small clean, dry beaker (or glass or jar). For highest accuracy you should know the temperature of the solution (ideally 25 deg. C). You really need a good thermometer for accurate work. Your unknown sample should be adjusted to 25 deg also at the time of measurement. You can warm the sample to 25 deg. C by holding it against your warm skin for a while if it's within a few degrees of 25. If the sample is really cold try 5 or 10 seconds in a microwave oven. If you over do it just wait until it cools back to where you want it. Start with the pH 7 standard and immerse the pH electrode in the small calibration sample and follow the instructions provided by your meter manufacturer. Do NOT return the used buffer to the original bottle as this will ruin the integrity of the original standard. Throw it away. The original bottle will be good for a year or more if handled properly. **Q: Are all the solutions compatible with bluelab ph meters** A: Yes. Buffer solutions are buffer solutions. Simply ph’d fluid for meters to calibrate from. Brand of instrument makes no difference ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great. Better alternative to more expensive brands. *by S***E on November 8, 2020* Great product. Will buy again. Accurate and high volume for the price. ### ⭐⭐⭐⭐⭐ Will buy more for sure! ⭐️⭐️⭐️⭐️⭐️ *by I***1 on August 22, 2025* I love it! ### ⭐⭐⭐⭐⭐ The best calibration chem!! *by M***E on October 24, 2021* This is the dope. Love it!! Better than mixing powder. Always on hand Always ready. Except nothing less ## Frequently Bought Together - pH Buffer Calibration Solution 3-Pack: pH 4.00 Buffer, pH 7.00 Buffer, and Electrode Storage Solution — 250 mL (8.4 fl oz) Each — NIST Traceable Reference Standards for All pH Meters - Milwaukee Instruments MW102 PH and Temperature Meter - Milwaukee Instruments MA9016 Cleaning Solution for pH/ORP Electrode, 230 mL Volume --- ## 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.tn/products/34656360-ph-buffer-calibration-solution-3-pack-ph-4-00-buffer](https://www.desertcart.tn/products/34656360-ph-buffer-calibration-solution-3-pack-ph-4-00-buffer) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-04-26*