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 TDS メーター用校正液 342ppm 、90ml ボトル、塩化ナトリウム水溶液 ( NaCl )

HM Digital TDS メーター用校正液 342ppm 、90ml ボトル、塩化ナトリウム水溶液 ( NaCl )

Product ID: 734408930

Details

Brand
HM Digital
Item Weight
100 Grams
Item Volume
90 Milliliters
Item Form
Liquid
UPC
891144000014

🔧Compatible with KCL-5 & 700US meters

🧴90ml leak-proof HDPE bottle

⚗️342ppm precise calibration

Description

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

UNIVERSAL COMPATIBILITY - Works seamlessly with popular models like KCL-5 (362ppm) and 700US meters.
COMPACT LEAK PROOF DESIGN - 90ml HDPE bottle with a secure lid for mess-free, on-the-go calibration.
ESSENTIAL FOR WATER QUALITY PROS - A must-have for professionals demanding precise TDS measurements every time.
RELIABLE SODIUM CHLORIDE FORMULA - Trusted NaCl reagent guarantees consistent and repeatable calibration results.
PRECISION CALIBRATED FOR ACCURACY - Ensure your TDS meter reads flawlessly with a stable 342ppm NaCl solution at 25°C.

This 90ml HDPE bottle contains a 342ppm sodium chloride (NaCl) calibration solution designed for precise TDS meter calibration at 25°C. Leak-proof and compatible with KCL-5 and 700US meters, it ensures reliable, repeatable water quality measurements for professionals.

Specifications

ASIN	B001VE99X8
Best Sellers Rank	#39,482 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Electrolyte Solutions
Brand	HM Digital
Brand Name	HM Digital
Container Type	Bottle
Customer Reviews	4.4 out of 5 stars 872 Reviews
Global Trade Identification Number	00891144000014
Item Form	Liquid
Item Volume	90 Milliliters
Item Weight	100 Grams
Manufacturer	HM Digital, Inc.
Model Number	C-342
Package Information	Bottle
Part Number	C342
UPC	891144000014
Unit Count	1.0 Count
Volume	90 Milliliters

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HM Digital TDS メーター用校正液 342ppm 、90ml ボトル、 塩化ナトリウム水溶液 ( NaCl )

Details

Details

Description

Specifications

Common Questions

HM Digital TDS メーター用校正液 342ppm 、90ml ボトル、塩化ナトリウム水溶液 ( NaCl )