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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🔬 Calibrate like a pro, measure like a boss!

DURABLE HDPE BOTTLE - Robust, chemical-resistant packaging that protects the solution’s integrity.
SECURE FOAM LINED SEAL - Prevents leaks and contamination, guaranteeing fresh calibration with every use.
TRUSTED US MADE QUALITY - Manufactured in the USA by HM Digital, a leader in water quality testing solutions.
COMPACT LIGHTWEIGHT DESIGN - Easy to carry and store, perfect for on-the-go professionals who demand reliability.
PRECISION CALIBRATED FOR ACCURACY - Ensure your TDS meter delivers spot-on readings every time with the 342 ppm NaCl solution.

The HM Digital C342 Calibration Solution is a 342 ppm NaCl standard in a 90 ml transparent blue HDPE bottle, designed to precisely recalibrate HM Digital TDS meters and water quality testers. Featuring a secure foam-lined seal and made in the USA, it ensures consistent, reliable water quality measurements for professionals who demand accuracy.

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Manufacturer	HM Digital, Inc.
UPC	891144000014
Global Trade Identification Number	00891144000014
Part Number	C342
Item Weight	3.53 ounces
Product Dimensions	1.75 x 1.75 x 3 inches
Item model number	C-342
Is Discontinued By Manufacturer	No
Size	342ppm, 90 ml Capacity
Color	Transparent/Blue
Item Package Quantity	1
Number Of Pieces	1
Batteries Included?	No
Batteries Required?	No

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

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