Pardon my ignorance but after you get the reading what do you compare the number to? I didn't receive any chart.

You do not compare it to anything the number is the amount of electro conductivity in your water(ppm of dissolved solvent witch are mostly minerals)Pure water that reeds 0 ppm does not conduct electricity. If you want clean drinking water try to filter it to were it is around 50 ppm that way you still get some minerals witch your body needs. If you are using it for mixing fertilizer for your plants you should not exceed 600 ppm when they are small and do not exceed 1500 ppm when plant are larger with more roots.

The instructions say it's warranty is for 3 years. It's odd that there is no company name as to who it would be returned to. Who is the manufacturer?

Hi LmariThe brand name iSpring is stamped on the TDS meter itself. We are currently updating the manual for the TDS meter due to the typo in the warranty. This meter has a 1 year warranty and not 3. If you are experiencing any problems with this product please contact us at (678)261-7611.ThanksiSpring

Do it need a calibration solution?

Sure it works right out of the box, but i it accurate? The only way to know is with a calibration solution. Most meters are quite close when they are new, but as time goes by, the accuracy can decline. If you want accurate readings, get some calibration solution.

Essential minerals are also picked up by TDS meters and that is not an effective to way to check or test water quality. True?

True. TDC=S meters usually measure the EC of particles to indicate TDS (Total Dissolved Solids) Dissolved solids can be good or bad.

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💧 Stay ahead of water quality—because pure water is the new luxury.

COMPACT PORTABLE - Pocket-sized design with rugged metal casing and protective case—take it anywhere with confidence.
DUAL FUNCTIONALITY - Seamlessly switch between TDS and temperature tests for comprehensive water analysis.
FILTER CHANGE ALERT - Monitor your water filter’s effectiveness and never miss the perfect time to replace it.
INSTANT PURITY CHECK - Get real-time TDS readings with a simple button press—know your water quality in seconds.
PRECISION YOU CAN TRUST - High accuracy sensor ensures reliable data for your home, hydroponics, or industrial needs.

The iSpring TDS 3-Button Digital Water Quality Test Meter delivers fast, accurate readings of total dissolved solids and water temperature. Its rugged metal design and protective case make it ideal for professionals and home users alike, ensuring you always have reliable data to maintain optimal water purity across applications like drinking water, hydroponics, aquariums, and filtration systems.

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Brand	iSpring
Special Feature	High Accuracy
Colour	Pocket Size
Age Range (Description)	Adult
Included Components	1 TDS meter
Outer Material	Metal
Product Care Instructions	Wipe Clean
Net Quantity	1 Piece
Power Source	Battery Powered
Model Name	TDS 3-Button Digital Water Quality Tester
Response Time	2 Minutes
Reusability	Rechargeable
Style	Digital
UPC	662425070015
Global Trade Identification Number	00662425070015
Manufacturer	iSpring
Item model number	TDS3-FBAK
Product Dimensions	2.54 x 3.18 x 15.49 cm; 49.9 g
ASIN	B00IDBZ1A2

iSpring TDS 3-Button Digital Water Quality Test Meter with Temperature Test Function

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