My two tds meters read 150ppm and 160ppm in the solution. what am i doing wrong.

The reason for the discrepancy is that the TDS meters are not calibrated. You need to re-calibrate them following the manufacturers instructions.

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HM Digital 342ppm TDS Calibration Solution (a.k.a Water Testing Solution) 3 fl oz (90 ml)

HM Digital 342ppm TDS Calibration Solution (a.k.a Water Testing Solution) 3 fl oz (90 ml)

Product ID: 54009866

Details

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

💧342 PPM NaCl precision

🔒sealed foam liner for purity

🧪90 ml calibration volume

SAR 164

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

SAR 164

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to KSA.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

💧 Calibrate with Confidence — Because Accurate Water Testing Means Everything

SEALED FOR PURITY - Coated foam liner guarantees contamination-free calibration, preserving solution integrity.
TRUSTED BY EXPERTS - Join thousands of pros who rely on this solution to maintain peak device performance.
COMPACT 90 ML BOTTLE - Lightweight and portable—perfect for on-the-go professionals who demand accuracy.
UNIVERSAL COMPATIBILITY - Optimized for all HM Digital TDS meters and water quality testers—never second guess your data.
PRECISION CALIBRATED 342 PPM SOLUTION - Ensure your TDS meter delivers spot-on water quality readings every time.

The HM Digital 342ppm TDS Calibration Solution is a 90 ml NaCl-based liquid designed to recalibrate HM Digital TDS meters and water quality testers. Packaged in a lightweight HDPE bottle with a sealed foam liner, it ensures precise, contamination-free calibration for reliable water quality measurements.

Specifications

ASIN	B001VE99X8
Best Sellers Rank	91,601 in Garden ( See Top 100 in Garden ) 282 in Pool & Hot Tub Testers
Brand	HM Digital
Container Type	Bottle
Customer Reviews	4.5 4.5 out of 5 stars (847)
Global Trade Identification Number	00891144000014
Item Form	Liquid
Item Weight	100 Grams
Manufacturer	HM Digital
Manufacturer Part Number	C342
Model Number	C-342
UPC	891144000014
Volume	90 Millilitres

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Great price for an authentic product. Fast international shipping too!

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