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

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MX$1008

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In stock

Sold byAmazon MexicoDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔬 Calibrate with Confidence, Measure with Mastery!

VERSATILE COMPATIBILITY - Specifically formulated for HM Digital TDS meters and water quality testers to maintain peak performance.
COMPACT LIGHTWEIGHT DESIGN - Easy to handle and store with a 90 ml HDPE bottle that fits seamlessly into your toolkit.
PRECISION CALIBRATED FOR ACCURACY - Ensure your TDS meter reads perfectly with the trusted 342 ppm NaCl solution.
TRUSTED BY PROFESSIONALS WORLDWIDE - Backed by 843+ reviews and a 4.5-star rating, join the community that demands accuracy.
SECURE SEAL FOR LONG LASTING PURITY - Coated foam liner guarantees contamination-free calibration every time.

The HM Digital C342 Calibration Solution offers a precise 342 ppm NaCl concentration in a convenient 90 ml HDPE bottle, sealed with a foam liner to maintain purity. Designed to recalibrate HM Digital TDS meters and water quality testers, it ensures reliable and accurate water quality measurements trusted by professionals globally.

Specifications

ASIN	B001VE99X8
Brand	HM Digital
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.5 out of 5 stars 843 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

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$1008

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.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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