TDS METER FOR WATER TESTING
Instantly measures Total Dissolved Solids (TDS) to reveal what’s really in your water. This simple digital test delivers fast, accurate readings so you can compare tap water vs. filtered water, verify reverse osmosis performance, and confirm your filtration system is working as it should.
Made In USA
Secure Checkout
Durable & Long Lasting
Display: Clear digital screen for instant, easy-to-read results.
Operation: One-button use with immediate readings in seconds.
Use Cases: Tap water testing, filtered water comparison, RO verification, RV and travel water checks.
Instant Water Quality Insights
Measure Total Dissolved Solids (TDS) in seconds—compare sources, verify filtration performance, and know your numbers fast.
Fast, Accurate TDS Readings
Get an instant digital TDS (PPM) reading in seconds so you can quickly understand your water’s dissolved solids level.
Simple Digital Display
Clear, easy-to-read screen makes results straightforward—no guessing, no complicated steps.
Compare Tap vs. Filtered Water
Quickly test before and after filtration to see if your RO, RV, or under-sink system is making a measurable difference.
Perfect for Home & Travel
Ideal for homeowners, RV travelers, and anyone who wants a quick water-quality check at the sink, on the road, or at a new source.
TDS Meter Guide
How Pure Is Your Water?
Use your TDS meter to measure Total Dissolved Solids in PPM (parts per million). Lower numbers generally mean fewer dissolved solids. Use this chart as a quick reference to compare sources and check “before vs. after” filtration.
0–50 PPM
Ideal drinking water (often RO/DI/distilled and similar low-TDS sources).
50–100 PPM
Common with carbon-filtered water and some spring waters.
100+ PPM
Often indicates hard water or higher mineral content (tap/mineral springs can run much higher).
Note: TDS is a general measurement of dissolved solids. It does not identify specific contaminants. Also, mineral-added or alkaline water can read higher due to beneficial minerals.
How the TDS Test Works
See how to measure Total Dissolved Solids (TDS) in seconds. Use the digital meter to compare tap vs. filtered water, verify reverse osmosis performance, and quickly spot when water may be high in dissolved minerals or buildup.
From our customers
FAQs
Answers about how to use the TDS Water Quality Test, understanding results, comparing tap vs. filtered water, and basic care.
What does a TDS meter measure?
It measures Total Dissolved Solids (TDS)—the amount of dissolved material in water—reported as PPM (parts per million). This can reflect dissolved minerals and salts and helps you compare water sources.
Does TDS tell me exactly what contaminants are in my water?
No. TDS is a general indicator of dissolved solids level. It does not identify specific contaminants (like lead or PFAS) or tell you if water is microbiologically safe.
For specific contaminant detection, use a certified lab test or targeted test kits.
How do I use the TDS Water Quality Test?
Turn the meter on, place the probe in a cup of water, wait a few seconds for the number to stabilize, then record the PPM reading. Rinse the probe with clean water after use.
Do I need to calibrate it?
For typical home comparisons (tap vs. filtered), most users don’t need calibration. If you want maximum precision, you can calibrate using a TDS calibration solution per the solution’s instructions.
What’s a “good” TDS number?
It depends on your source water and goals. Many people prefer a lower reading for purified water, while mineral-added or alkaline water can read higher due to added minerals.
Use this meter mainly to compare before vs. after filtration and to spot changes over time.
Why did my filtered water read higher than my tap water?
If your system adds minerals (common in alkaline/mineral stages), TDS can increase. A higher reading isn’t automatically “bad”—it may reflect beneficial mineral content.
How can I verify my RO system is working?
Test your tap water (feed) and RO water (product) and compare the results. A strong RO system typically shows a significant reduction in TDS compared to the feed water. Track readings over time to spot membrane wear.
Can I use it for RV, travel, or well water?
Yes. It’s great for checking different water sources on the road and monitoring well or campground water for big changes in dissolved solids.
Can I test hot water?
For best consistency, test room-temperature or cold water. Very hot water can affect readings and may not match your normal drinking-water conditions.
How do I clean and store the meter?
Rinse the probe with clean water after each test, shake off excess, and store it dry with the cap on. Avoid dropping the meter or submerging past the probe area.
My reading is jumping around—what should I do?
Stir the sample gently, keep the probe still, and wait a few seconds for stabilization. Rinse the probe and try a fresh cup if residues or bubbles are present.
TDS is a general indicator of dissolved solids and is best used to compare water sources and monitor changes over time. It does not identify specific contaminants or pathogens.