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.

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Hm Digital C342 Tds and Ec Calibration Solution 342 Ppm Nacl 90 Ml Volume

Hm Digital C342 Tds and Ec Calibration Solution 342 Ppm Nacl 90 Ml Volume

Product ID: 474461854

Details

Brand
HM Digital
Item Volume
90 Millilitres
Item Weight
100 Grams
Manufacturer
HM Digital
UPC
891144000014

🔒airtight coated foam liner seal

🧴90 ml compact, easy-to-store volume

⚖️342 ppm precise NaCl concentration

MX$1873

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Description

⚡ Calibrate like a pro — precision you can trust, every drop counts!

AIRTIGHT FOAM LINED SEAL - Maintains solution integrity for repeated, reliable calibrations over time.
EFFORTLESS CALIBRATION PROCESS - Simple, ready-to-use solution that saves time and guarantees consistent results.
COMPACT CONVENIENT 90 ML BOTTLE - Perfectly sized for professional use and easy storage without clutter.
TRUSTED BY INDUSTRY PROFESSIONALS - Backed by HM Digital’s reputation and 4.5-star rating from 800+ users.
PRECISION CALIBRATED NA CL SOLUTION - Ensure your TDS meter reads with laboratory-grade accuracy at 342 ppm.

The HM Digital C342 Calibration Solution offers a precise 342 ppm NaCl concentration in a convenient 90 ml bottle, sealed with a foam liner to ensure airtight freshness. Designed for easy, repeatable calibration of TDS meters, it’s a trusted choice among professionals seeking accuracy and reliability in water quality testing.

Specifications

ASIN	B001VE99X8
Best Sellers Rank	#56,876 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,200 in Lab Chemicals
Brand	HM Digital
Brand Name	HM Digital
Country Of Origin	USA
Customer Reviews	4.5 out of 5 stars 843 Reviews
Global Trade Identification Number	00891144000014
Item Volume	90 Millilitres
Item Weight	100 Grams
Manufacturer	HM Digital
Manufacturer Part Number	C342
Model Number	C-342
UPC	891144000014
Volume	90 Millilitres
Whats in the box?	1

Reviews

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

D**C

Produit de Calibration.

Excellent produit 👍

1.04.2026

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MX$1873

Duties & taxes included

In stock

Sold byAmazon MexicoDelivered 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 Mexico.

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