TDS Meter
Rs. 299
MRP Rs. 399
25% OFF
4.5/5
Rated by 233 customers
✓ Digital ppm readout in under 10 seconds
✓ Hold function freezes the reading
✓ Compact pen design, button-cell powered
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✓ Dispatched within 2 business days
✓ Estimated delivery within 7 days of dispatch
✓ Free shipping on orders over ₹500
✓ 6-month brand warranty
TDS Meter
Rs. 299
MRP Rs. 399
25% OFF
100–300ppm range most water-quality sources recommend
5 tierson the WHO taste-panel palatability scale
<10 secto a reading — dip, wait, read
Why a TDS meter & how it works
You filter it, boil it, buy it bottled — but never measured it.
The one number you can’t see.
Water quality is invisible, so most of us trust an RO system, a filter, or a bottled brand on faith. TDS is the number that checks it — the combined weight of everything dissolved in a litre of water.
Too low, and minerals worth having get stripped out. Too high, and taste, scale, and safety questions begin. The only way to know which side your water is on is to measure it — on any tap, filter, or bottle you can dip into.
mg/L = ppm
TDS is read in milligrams per litre, which equals parts per million. A reading of 247 mg/L and 247 ppm mean exactly the same thing.
It doesn’t weigh your water. It listens to it.
Dissolved minerals carry an electric charge, so the more there are, the better water conducts. The meter reads that conductivity and converts it to an estimated ppm value in seconds.
1
Dissolved ions carry charge in the water.
2
The probe reads conductivity (µS/cm).
3
It converts to ppm on screen in seconds.
The lab gold standard — gravimetric method APHA 2540 C — evaporates a sample and weighs the residue. It’s more precise, but the meter trades a little precision for something you can use at home, every day.
What one reading tells you
🧂
Mineral balance
Whether your water leans mineral-rich or mineral-poor.
🚰
Filter health
Whether an RO or filter is over- or under-stripping.
🔎
Source changes
Whether a change in tap or bottled water is worth a closer look.
What the number means
Not a safety cutoff — a taste-panel scale, precisely defined.
The folk number — “up to 900 is drinkable” — is a loose gloss. WHO’s background document rates palatability across five tiers from taster panels, not a toxicity threshold.
| mg/L (ppm) | WHO taste-panel rating |
|---|---|
| Below 300 | Rated “excellent” — the range most guides recommend, often narrowed to 100–300 mg/L for the best balance of taste and minerals. |
| 300–600 | Rated “good” — a noticeable mineral presence, still pleasant to most tasters. |
| 600–1200 | Rated “fair” then “poor” as taste declines. For context, the EPA’s aesthetic guideline sits far lower, at 500 mg/L. |
| Above 1200 | Rated “unacceptable” by taste panels on grounds of palatability. |
The everyday sweet spot — 100–300 ppm
Below ~50 ppm water tastes flat; the EPA’s aesthetic guideline is 500. Independent guides converge on this middle band for daily drinking water.
Very low-mineral water isn’t automatically purest.
RO, distillation, and desalination strip calcium, magnesium, and iodine along with contaminants. Low-TDS water is linked to magnesium and calcium deficiency; desalinated water removes iodine (Koren et al., 2018).
High readings aren’t automatically dangerous.
TDS measures quantity, not identity — high can mean harmless hard-water minerals, or nitrates and metals. It can’t detect bacteria or name specific contaminants; that needs a certified lab test.
How to use
Dip, wait, read.
🔓
1
Uncap & power on
Remove the cap and switch it on.
💧
2
Submerge to the line
Dip the probe to the mark — no further.
⏱️
3
Stir & settle
Wait a few seconds; press HOLD to freeze.
📋
4
Read, then rinse
Note the ppm, rinse, dry, and re-cap.
Why choose Tattwas
A precise reading, honest about its limits.
A compact digital pen that reads the TDS of any water sample in seconds — tap, RO, filtered, or bottled — with no calibration ritual for everyday use.
Specifications
Digital TDS readout · Hold function · Compact pen design · Button-cell powered · Reading in under 10 seconds · 6-month warranty
| Tattwas TDS Meter | Paper / strip tests | Lab gravimetric test | |
|---|---|---|---|
| Reading type | Digital ppm value on screen | Rough colour match | Exact, by weight |
| Speed | Under 10 seconds | Minutes | Days (send-away) |
| Reusable | Yes | Single-use | — |
| Everyday calibration | None required | — | Lab-controlled |
| Identifies contaminants | No — screening only | No | Yes — definitive |
| Cost per use | Negligible | Recurring | High |
Honest by design
This is a water-quality screening tool, not a certified safety instrument. For a full contaminant profile — bacteria, specific metals, pesticide residues — use a certified laboratory. Saying so plainly is the point.
Scientific evidence
Every claim traces back to a source.
1World Health Organization
Total Dissolved Solids in Drinking-water (WHO/SDE/WSH/03.04/16). who.int
2US EPA
Secondary Drinking Water Standards — non-enforceable 500 mg/L guideline (aesthetic). epa.gov
3Bureau of Indian Standards (BIS) 10500
Acceptable and permissible TDS limits for drinking water in India.
4Health Risk from Drinking Demineralized Water
Review of low-TDS water intake and mineral balance (citing Rakhmanin et al.).
5Koren G, Amitai Y, Shlezinger M, et al. (2018)
Sea water desalination and removal of iodine. J. Water & Health, 16(3):472–475.· Read source →
6APHA Standard Method 2540 C
Gravimetric total dissolved solids (reference lab method).
7Manufacturer specifications
Digital TDS meter, button-cell powered, 6-month brand warranty.
A note on scope. This device is intended for general water-quality screening and is not a certified safety-testing instrument. For specific health concerns, consult a certified laboratory or your physician.
Founder image
From our founder
“Whatever you see, touch, eat or drink… has an energy, and that energy is made from only 5 elements.”
Vishall
Founder, Tattwas
Founder, Tattwas
Good to know
FAQ
Everything you need before adding to basket.
How accurate is it versus a lab test? +
It estimates TDS from conductivity — excellent for tracking and screening. It isn’t a certified contaminant analysis; to identify specific substances, use a lab.
Can it detect bacteria or heavy metals? +
No. TDS measures the total quantity dissolved, not its identity. It can’t detect pathogens or name specific metals — that needs targeted lab testing.
Is low-TDS RO water bad for me? +
Not inherently — but very low-mineral water removes calcium and magnesium (and iodine in desalinated water). The meter shows if your RO is over-stripping.
What TDS level should I aim for? +
Roughly 100–300 ppm balances taste and minerals; below ~50 tastes flat; the EPA’s aesthetic guideline is 500. It’s a taste guide, not a strict safety line.
How do I clean and store it? +
Rinse the probe after each use, dry it, and keep it capped. It’s button-cell powered, so there’s no charging — just pick it up and read.
Can I use it beyond drinking water? +
Yes. It reads TDS in any water sample, so it’s handy for aquariums, hydroponics and gardening, and for checking whether an RO cartridge still needs replacing.
TDS Meter ·
Rs. 299
MRP Rs. 399
25% OFF
★★★★★ 4.5/5
Ancient elements, everyday wellness
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