What is the shelf life?

Room temp. indefinitely. You will use it up before it gets really old.

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

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!

Can you mix this with 1000 solution to get 680ish ppm mix?

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.

What screwdriver is used to calibrate this meter? The little ones I've used don't turn anything.

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.

Hm Digital C342 Tds And Ec Calibration Solution 342 Ppm

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Description

🔬 Calibrate like a pro, measure like a boss.

UNIVERSAL COMPATIBILITY - Optimized for all HM Digital TDS meters and water quality testers—never second guess your readings.
AIRTIGHT FOAM LINED SEAL - Maintains solution integrity and prevents contamination for consistent recalibration results.
TRUSTED BY 800 VERIFIED USERS - Join a community of savvy users who rely on HM Digital for flawless water testing.
COMPACT PORTABLE 90 ML BOTTLE - Perfectly sized for on-the-go professionals who demand reliable water quality checks anywhere.
PRECISION CALIBRATED 342 PPM NA CL SOLUTION - Ensure your TDS meter reads with laboratory-grade accuracy every time.

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 lightweight 90 ml HDPE bottle with a secure foam-lined seal, it ensures long-lasting accuracy and contamination-free use. Trusted by hundreds of professionals, this solution guarantees your water quality readings stay reliable and consistent.

Specifications

ASIN	B001VE99X8
Brand	HM Digital
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.5 out of 5 stars 841 Reviews
Global Trade Identification Number	00891144000014
Item Form	Liquid
Item Weight	100 Grams
Item form	Liquid
Item volume	90 Milliliters
Item weight	100 Grams
Manufacturer	HM Digital, Inc.
Model Number	C-342
Package information	Bottle
Part Number	C342
UPC	891144000014
Unit Count	1 Count
Unit count	1 Count
Volume	90 Milliliters

Reviews

A**I

Useful for calibration

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

7.08.2020

J**O

Small Bottle, Use Again

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.

16.04.2025

C**Y

Prompt as described

Great

7.12.2020

M**U

Accuracy

Excellent product!

5.12.2022

B**R

Gute qualitet und Rechnung war auch sofort da Danke

23.02.2026

C**E

If you need t d s or e c calibration , this one is for you

Good size works well definitely by again

9.05.2026

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

NZ$53

Duties & taxes included

In stock

Sold byAmazon New ZealandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to New Zealand.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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