--- product_id: 2872346 title: "C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue" brand: "hm digital" price: "76 zł" currency: PLN in_stock: true reviews_count: 13 url: https://www.desertcart.pl/products/2872346-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90 store_origin: PL region: Poland --- # Foam liner sealed freshness 90 ml lightweight HDPE bottle 342 ppm NaCl precision C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue **Brand:** hm digital **Price:** 76 zł **Availability:** ✅ In Stock ## Summary > ⚡ Calibrate like a pro, measure like a boss! ## Quick Answers - **What is this?** C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue by hm digital - **How much does it cost?** 76 zł with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/2872346-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90) ## Best For - hm digital enthusiasts ## Why This Product - Trusted hm digital brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile Compatibility:** Optimized for HM Digital TDS meters and water quality testers—never second guess your readings. - • **Compact & Lightweight 90 ml Bottle:** Portable design perfect for on-the-go professionals who demand reliability. - • **Foam-Lined Seal for Long-Lasting Purity:** Maintains solution integrity, so your calibration stays flawless. - • **Trusted by Thousands with 4.5⭐ Rating:** Join a community of experts who rely on HM Digital for consistent water quality testing. - • **Precision-Calibrated 342 ppm NaCl Solution:** Ensure your TDS meter reads with laboratory-grade accuracy every time. ## Overview The HM Digital C342 Calibration Solution is a 342 ppm NaCl liquid designed to precisely recalibrate HM Digital TDS meters and water quality testers. Packaged in a 90 ml lightweight HDPE bottle with a foam-lined seal, it ensures long-lasting purity and accuracy. Trusted by professionals worldwide, this solution guarantees your water quality readings remain reliable and consistent. ## Description Product Description TDS Meter NaCl Calibration Solution C-342. From the Manufacturer TDS Meter NaCl Calibration Solution C-342. Review: Works great as described - Works great excellent product. Brought everything door needed to be for collaboration of calibration. Review: Great item to have - It is good to have this to calibrate my TDS tester. I have never needed to calibrate my tester but decided to make sure that it still works after 3 years ilof periodic usage. Only issue is the cost and there is so much of it that I won't need to use again for a few more years. ## Features - NaCl calibration solution, available in 342 ppm or 1000 ppm - Comes in lightweight HDPE plastic bottles - Sealed with a coated foam liner - Use the HM Digital TDS Calibration Solution (342 PPM) to periodically re-calibrate your HM Digital TDS meter or HM Digital Water Quality Tester - This HM Digital TDS Calibration Solution is also known as Water Tester Solution andTDS Meter Calibration Solution - The C-342 is NaCl solution (342 PPM) ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001VE99X8 | | Best Sellers Rank | #34,349 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Electrolyte Solutions | | Brand Name | HM Digital | | Container Type | Bottle | | Customer Reviews | 4.5 4.5 out of 5 stars (866) | | Global Trade Identification Number | 00891144000014 | | Item Form | Liquid | | Item Weight | 100 Grams | | Manufacturer | HM Digital, Inc. | | UPC | 891144000014 | | Unit Count | 1.0 Count | | Volume | 90 Milliliters | ## Product Details - **Brand:** HM Digital - **Item Form:** Liquid - **Item Volume:** 90 Milliliters - **Item Weight:** 100 Grams - **Package Information:** Bottle ## Images ![C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue - Image 1](https://m.media-amazon.com/images/I/61U5LTc9u8L.jpg) ## Questions & Answers **Q: What is the shelf life?** A: Room temp. indefinitely. You will use it up before it gets really old. **Q: Whats the ppm at 19 degree Celsius? or 18.6? The box only states the ppm of the solution at 25C which is is 342 ppm** A: I doubt the actual PPM is much different between 19C and 25C. TDS/EC meters are typically sensitive to temperature and some include a temperature sensor for automatic correction. Others that don't automatically compensate for temperature and may need a "look-up" to correct during the calibration. In either case, the reference solution concentration probably doesn't change much as a function of temperature. Good luck with your TDS calibration! **Q: Can you mix this with 1000 solution to get 680ish ppm mix?** A: All you need to do to create a 680 ppm test solution is add .068 grams of table salt to 100ml of distilled or RODI water and dissolve and viola you have a 680 ppm test solution. **Q: What screwdriver is used to calibrate this meter? The little ones I've used don't turn anything.** A: Usually there is a small area on the back of the meter that takes a tiny Phillips head screwdriver. You would put the meter in the solution and then use the screwdriver to make sure it's reading 342. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great as described *by J***6 on January 24, 2026* Works great excellent product. Brought everything door needed to be for collaboration of calibration. ### ⭐⭐⭐⭐⭐ Great item to have *by D***G on February 12, 2025* It is good to have this to calibrate my TDS tester. I have never needed to calibrate my tester but decided to make sure that it still works after 3 years ilof periodic usage. Only issue is the cost and there is so much of it that I won't need to use again for a few more years. ### ⭐⭐⭐⭐ Good value *by N***T on November 6, 2025* Last a long time ## Frequently Bought Together - HM Digital C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue - HM Digital TDS-3 Handheld TDS Meter With Carrying Case, 0 - 9990 ppm TDS Measurement Range, 1 ppm Resolution, +/- 2% Readout Accuracy - HM Digital 1000ppm TDS Calibration Solution --- ## 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.pl/products/2872346-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90](https://www.desertcart.pl/products/2872346-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90) --- *Product available on Desertcart Poland* *Store origin: PL* *Last updated: 2026-04-25*