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, Transparent/Blue

HM Digital C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue

Product ID: 2872346

Details

Brand
HM Digital
Item Form
Liquid
Item Volume
90 Milliliters
Item Weight
100 Grams
Package Information
Bottle

🔒Foam liner sealed for purity

🧴90 ml lightweight HDPE bottle

⚖️342 ppm NaCl precision

A$22

Duties & taxes included

In stock

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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.
TRUSTED BY INDUSTRY LEADERS - Ranked #5 in Electrolyte Solutions, backed by 875+ positive reviews.
PRECISION CALIBRATED 342 PPM NA CL - Ensure your TDS meter reads with lab-grade accuracy every time.
COMPACT LIGHTWEIGHT 90 ML BOTTLE - Easy to handle and store, perfect for on-the-go professionals.
FOAM LINED SEAL FOR CONTAMINATION FREE USE - Maintains solution integrity so your readings never falter.

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 90 ml lightweight HDPE bottle with a foam-lined seal, it guarantees contamination-free, reliable calibration. Trusted by professionals and ranked top 5 in electrolyte solutions, it ensures your water quality readings stay accurate and consistent.

Specifications

ASIN	B001VE99X8
Best Sellers Rank	#32,999 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Electrolyte Solutions
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.4 4.4 out of 5 stars (875)
Global Trade Identification Number	00891144000014
Item Form	Liquid
Item Weight	100 Grams
Manufacturer	HM Digital, Inc.
Model Number	C-342
Part Number	C342
UPC	891144000014
Unit Count	1.0 Count
Volume	90 Milliliters

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