---
product_id: 272808257
title: "C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue"
brand: "hm digital"
price: "11.77 OMR"
currency: OMR
in_stock: true
reviews_count: 6
category: "Hm Digital"
url: https://www.desertcart.com.om/products/272808257-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90
store_origin: OM
region: Oman
---

# airtight coated foam liner seal 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:** 11.77 OMR
**Availability:** ✅ In Stock

## Summary

> 🔬 Calibrate with Confidence — Because Accuracy is Non-Negotiable

## 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?** 11.77 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/272808257-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

- • **Durable Airtight Seal:** Coated foam liner keeps solution fresh and contamination-free
- • **Long-Lasting & Reusable:** Perfect for multiple calibrations when stored properly
- • **Trusted by Professionals:** Used by water quality experts to maintain reliable readings
- • **Compact & Portable Design:** 90 ml bottle fits effortlessly in your toolkit or lab space
- • **Precision-Calibrated for Accuracy:** Ensure your TDS meter reads true with 342 ppm NaCl standard

## Overview

The HM Digital C342 Calibration Solution offers a precise 342 ppm NaCl concentration in a convenient 90 ml HDPE bottle, sealed with a coated foam liner to maintain solution integrity. Designed specifically for recalibrating HM Digital TDS meters and water quality testers, it ensures consistent, reliable readings for professionals and enthusiasts alike.

## Description

TDS Meter NaCl Calibration Solution C-342.

Review: Useful for calibration - Used this to check whether all my TDS pens are accurate or not
Review: I calibrated my TDS meter just fine. I used a better air tight jar and poured it all into it, that way I can use it multiple times. I will buy again. Delivery good.

## 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 |
| ASIN  | B001VE99X8 |
| Batteries Included? | No |
| Batteries Required? | No |
| Color | Transparent/Blue |
| Customer Reviews | 4.4 4.4 out of 5 stars (814) |
| Customer reviews | 4.4 4.4 out of 5 stars (814) |
| Date First Available | 7 August 2012 |
| Date First Available  | 7 August 2012 |
| Global Trade Identification Number | 00891144000014 |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 100 g |
| Item model number | C-342 |
| Item model number  | C-342 |
| Manufacturer | HM Digital, Inc. |
| Manufacturer  | HM Digital, Inc. |
| Number Of Pieces | 1 |
| Part number | C342 |
| Product Dimensions | 4.45 x 4.45 x 7.62 cm; 100 g |
| Product Dimensions  | 4.45 x 4.45 x 7.62 cm; 100 g |
| 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

### ⭐⭐⭐⭐⭐ Useful for calibration
*by A***I on 7 August 2020*

Used this to check whether all my TDS pens are accurate or not

### ⭐⭐⭐⭐⭐ Review
*by J***O on 16 April 2025*

I calibrated my TDS meter just fine. I used a better air tight jar and poured it all into it, that way I can use it multiple times. I will buy again. Delivery good.

### ⭐⭐⭐⭐⭐ Review
*by C***Y on 7 December 2020*

Great

## 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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**Shop now:** [https://www.desertcart.com.om/products/272808257-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90](https://www.desertcart.com.om/products/272808257-c342-tds-and-ec-calibration-solution-342-ppm-nacl-90)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-03-11*