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 freshness

🧴90 ml lightweight HDPE bottle

⚗️342 ppm NaCl precision

₹ 1906

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Description

⚡ Calibrate like a pro, measure like a boss!

FOAM LINED SEAL FOR PURITY - Maintains solution integrity by preventing contamination and evaporation.
COMPACT DURABLE HDPE BOTTLE - Lightweight design for easy storage and long-lasting use without spills.
LONG TERM VALUE RELIABILITY - Use periodically to extend your meter’s lifespan and avoid costly replacements.
PRECISION CALIBRATED 342 PPM NA CL - Ensure your TDS meter reads with laboratory-grade accuracy every time.
TRUSTED BY PROFESSIONALS WORLDWIDE - Join thousands of experts who rely on HM Digital for consistent water quality testing.

The HM Digital C342 Calibration Solution is a 342 ppm NaCl liquid designed to precisely recalibrate TDS and EC meters. Packaged in a 90 ml lightweight HDPE bottle with a foam-lined seal, it ensures long-lasting purity and accuracy. Ideal for professionals and enthusiasts who demand reliable water quality testing, this solution helps maintain meter performance and extends device longevity.

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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₹ 1906

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In stock

Sold byAmazon IndiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

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