---
product_id: 2872346
title: "C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue"
brand: "hm digital"
price: "€ 18.50"
currency: EUR
in_stock: true
reviews_count: 13
category: "Hm Digital"
url: https://www.desertcart.fr/products/2872346-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90
store_origin: FR
region: France
---

# 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:** € 18.50
**Availability:** ✅ In Stock

## Summary

> ⚡ Calibrate with Confidence, Measure with Mastery!

## 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?** € 18.50 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/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

- • **Trusted by Professionals:** Top-rated calibration solution with 4.4 stars from 857 users—join the savvy pros who never compromise on accuracy.
- • **Compact & Portable Design:** Lightweight 90 ml HDPE bottle fits perfectly in your toolkit for on-the-go calibration.
- • **Long-Lasting Seal Integrity:** Foam liner seal guarantees solution purity and reliability over extended periods.
- • **Future-Proof Your Water Testing:** Maintain peak performance of your HM Digital TDS meter and avoid costly measurement errors.
- • **Precision-Calibrated for Accuracy:** Ensure your TDS meter delivers spot-on readings every time with the trusted 342 ppm NaCl solution.

## Overview

The HM Digital C342 Calibration Solution is a 342 ppm NaCl standard in a 90 ml lightweight, sealed HDPE bottle designed to recalibrate HM Digital TDS meters for precise water quality testing. Trusted by professionals and backed by strong user ratings, it ensures your water measurements remain accurate and reliable over time.

## 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 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #27,480 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Electrolyte Solutions |
| Color | Transparent/Blue |
| Customer Reviews | 4.4 4.4 out of 5 stars (857) |
| Date First Available | March 11, 2009 |
| Global Trade Identification Number | 00891144000014 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 3.53 ounces |
| Item model number | C-342 |
| Manufacturer | HM Digital, Inc. |
| Number Of Pieces | 1 |
| Part Number | C342 |
| Product Dimensions | 1.75 x 1.75 x 3 inches |
| Size | 342ppm, 90 ml Capacity |
| UPC | 891144000014 |

## 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.

### ⭐⭐⭐⭐⭐ Clearly reveals that an old meter readings are wrong and needs to be replaced
*by P***L on November 24, 2025*

My old meter was reading properly for distilled, filtered, and tap water. However, it only measured a little over 200 when inserted into this solution. Bought a new meter that measures very close to 340

## 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

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*Product available on Desertcart France*
*Store origin: FR*
*Last updated: 2026-03-03*