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 ml
Item Weight
100 g
Package Information
Bottle

🔒Foam liner seal for purity

🧴90 ml lightweight HDPE bottle

⚗️342 ppm NaCl precision

6.45 OMR

Duties & taxes included

In stock

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Description

⚡ Calibrate like a pro, measure like a boss!

SECURE FOAM LINED SEAL - Maintains solution integrity for reliable recalibration every time
VERSATILE COMPATIBILITY - Optimized for HM Digital TDS meters and water quality testers
TRUSTED BY PROFESSIONALS - Top-rated (#3 Electrolyte Solutions) with 4.4-star user approval
COMPACT PORTABLE DESIGN - 90 ml bottle fits perfectly in your lab kit or field bag
PRECISION CALIBRATED NA CL SOLUTION - Ensure your TDS meter reads flawlessly with 342 ppm accuracy

The HM Digital C342 Calibration Solution is a 342 ppm NaCl liquid designed for precise recalibration of HM Digital TDS meters and water quality testers. Packaged in a lightweight, 90 ml HDPE bottle with a foam-lined seal, it ensures consistent accuracy and reliability, making it a top choice among professionals and ranked #3 in Electrolyte Solutions.

Specifications

ASIN	B001VE99X8
Best Sellers Rank	#22,253 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Electrolyte Solutions
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.4 4.4 out of 5 stars (877)
Global Trade Identification Number	00891144000014
Item Form	Liquid
Item Weight	100 g
Manufacturer	HM Digital, Inc.
Model Number	C-342
Part Number	C342
UPC	891144000014
Unit Count	1 Count
Volume	90 ml

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