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

Product ID: 272808257

Details

Brand
HM Digital
Item form
Liquid
Item volume
90 Milliliters
Item weight
100 Grams
Package information
Bottle

🔒airtight coated foam liner seal

🧴90 ml lightweight HDPE bottle

⚖️342 ppm NaCl precision

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$60.75

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Sold byAmazon EcuadorDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔬 Calibrate with Confidence — Because Accuracy is Non-Negotiable

DURABLE AIRTIGHT SEAL - Coated foam liner keeps solution fresh and contamination-free
LONG LASTING REUSABLE - Perfect for multiple calibrations when stored properly
TRUSTED BY PROFESSIONALS - Used by water quality experts to maintain reliable readings
COMPACT PORTABLE DESIGN - 90 ml bottle fits effortlessly in your toolkit or lab space
PRECISION CALIBRATED FOR ACCURACY - Ensure your TDS meter reads true with 342 ppm NaCl standard

The HM Digital C342 Calibration Solution offers a precise 342 ppm NaCl concentration in a convenient 90 ml HDPE bottle, sealed with a coated foam liner to maintain solution integrity. Designed specifically for recalibrating HM Digital TDS meters and water quality testers, it ensures consistent, reliable readings for professionals and enthusiasts alike.

Specifications

ASIN	B001VE99X8
ASIN	B001VE99X8
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.5 4.5 out of 5 stars (841)
Customer reviews	4.5 4.5 out of 5 stars (841)
Date First Available	7 August 2012
Global Trade Identification Number	00891144000014
Is Discontinued By Manufacturer	No
Item Form	Liquid
Item Weight	100 Grams
Item model number	C-342
Manufacturer	HM Digital, Inc.
Manufacturer	HM Digital, Inc.
Model Number	C-342
Part Number	C342
Product Dimensions	4.45 x 4.45 x 7.62 cm; 100 g
UPC	891144000014
Unit Count	1 Count
Volume	90 Milliliters

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