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

🧪Calibrates TDS meters accurately

🛡️Sealed with foam liner for purity

14.30 OMR

Duties & taxes included

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Sold byAmazon OMANDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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TrustScore 4.5 | 7,300+ reviews

14.30 OMR

Duties & taxes included

In stock

Sold byAmazon OMANDelivered 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 OMAN.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

💧 Calibrate with Confidence, Measure with Mastery

LIGHTWEIGHT PORTABLE - Compact 90 ml HDPE bottle fits perfectly in your toolkit or lab bench without bulk.
UNIVERSAL COMPATIBILITY - Specifically formulated for HM Digital TDS meters and water quality testers—no guesswork needed.
TRUSTED BY PROFESSIONALS - Backed by 4.5-star reviews and a top rank in Pool & Hot Tub Testers—join the savvy water quality pros.
LONG LASTING SEAL INTEGRITY - Foam-lined cap guarantees contamination-free calibration for consistent performance.
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 precisely recalibrate HM Digital TDS meters and water quality testers. Packaged in a lightweight, foam-sealed HDPE bottle, it ensures contamination-free, reliable calibration for accurate water quality monitoring.

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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