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

Product ID: 474461854

Details

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

🔒sealed with coated foam liner for purity

🧴90 ml calibrated volume

⚖️342 ppm precise NaCl concentration

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Description

🔬 Calibrate like a pro—never second-guess your water quality again!

FOAM LINED SEAL - Maintains solution integrity by preventing contamination and evaporation.
COMPACT 90 ML VOLUME - Perfectly sized for lab and field use without waste or bulk.
TRUSTED BRAND QUALITY - HM Digital’s USA-made solution guarantees reliability and consistency.
READY TO USE CONVENIENCE - No mixing required—just open and calibrate for instant, professional results.
PRECISION CALIBRATED NA CL SOLUTION - Ensure your TDS meters deliver spot-on readings every time with 342 ppm accuracy.

The HM Digital C342 is a 90 ml NaCl calibration solution precisely formulated at 342 ppm, designed to ensure accurate TDS and EC meter readings. Sealed with a coated foam liner to maintain purity, this ready-to-use solution is manufactured in the USA by HM Digital, trusted by professionals for reliable water quality calibration.

Specifications

ASIN	B001VE99X8
Best Sellers Rank	#74,421 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,528 in Lab Chemicals
Brand Name	HM Digital
Country Of Origin	USA
Customer Reviews	4.5 4.5 out of 5 stars (846)
Global Trade Identification Number	00891144000014
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

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AED 133

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