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

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

المساعدة تتبع الطلب

الحساب عربة التسوق

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

المساعدة تتبع الطلب

الحساب عربة التسوق

AED 112

Duties & taxes included

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Description

⚡ Calibrate like a pro, measure like a boss!

UNIVERSAL COMPATIBILITY - Specifically formulated for HM Digital TDS meters and water quality testers to guarantee seamless recalibration.
AIRTIGHT FOAM LINED SEAL - Maintains solution integrity for repeated calibrations without contamination or evaporation.
TRUSTED BY 844 VERIFIED USERS - Join a community of meticulous testers who rely on HM Digital for consistent performance.
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 - Ensure your TDS meter reads with laboratory-grade accuracy every time.

The HM Digital C342 Calibration Solution delivers a precise 342 ppm NaCl concentration in a convenient 90 ml HDPE bottle, sealed with a foam liner to preserve accuracy. Designed to recalibrate HM Digital TDS meters, it ensures your water quality readings remain trustworthy and consistent, making it an essential tool for professionals who prioritize precision and reliability.

Specifications

ASIN	B001VE99X8
Brand	HM Digital
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.5 out of 5 stars 844 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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