HM Digital PH-200: Waterproof Professional Series pH/Temperature Meter PH and multi-parameter water tester
HM Digital
7.5/10
₹9,70025% off
Anyone who needs a pH and multi-parameter water tester
View details
🚿 Water treatment
Brand: HM Digital
HM Digital DM-3: Commercial In-Line Dual EC/TDS Monitor
in-line TDS monitor · TDS + EC · 2 lines
7.3/10
Our editorial score
Good — right for the specific buyer
Anyone who needs a in-line TDS monitor
- Filtration
- —
- CADR
- —
- Coverage
- —
- Noise
- —
About this water treatment product
- Measures TDS, EC in one instrument
- Shows the water quality continuously, so you see the day an RO membrane starts to fail
- Listed 10% below its MRP of ₹7,800
- Sold by HM Digital's own Indian store, so the warranty is the brand's
How it scores
Treatment capability7.3
Build & warranty7.2
Value within its type7.3
Upkeep (salt, cartridges)7.6
Brand support in India7.4
Catalogue listing — not a hands-on review
We have not tested this unit. The specifications below are parsed from the manufacturer's own listing, the features are their wording, and the score is calculated from those specifications rather than assigned by an editor. For models we have examined in depth, see our ranked water treatment products guides.
About this model
The HM Digital DM-3: Commercial In-Line Dual EC/TDS Monitor is a in-line TDS monitor at ₹7,020 (MRP ₹7,800), price checked 2026-10-08 on HM Digital's own Indian store.
An in-line monitor fits into the purifier's tubing and shows TDS continuously, so a failing RO membrane shows up the day it happens rather than months later.
This is a catalogue listing, not a hands-on review: the figures and features are the brand's own, and the score is calculated from them.
Manufacturer's stated features
- Measures TDS, EC in one instrument
- Shows the water quality continuously, so you see the day an RO membrane starts to fail
- Listed 10% below its MRP of ₹7,800
- Sold by HM Digital's own Indian store, so the warranty is the brand's
Worth noting
When this is not a good choice
Every condition below is derived from this product's published specifications and from how it compares with the water treatment products we track — so you can check each one against your own room, supply or budget rather than take our word for it.
You live outside a metro or a major service town
HM Digital's service network is rated limited rather than excellent. Spare parts and callout times decide how a water treatment product holds up over the years, so check service for your pin code before you buy.
How we score service reach →
Full specifications
| Type | In-line TDS monitor |
|---|---|
| Measures | TDS, EC |
| Monitored lines | 2 |
| Model code | DM-3 |
| Price source | HM Digital official store (hmdigital.in) |
Specifications are from manufacturer literature and were checked at the last price-verification date. Brands occasionally revise stage counts, tank sizes and warranty terms without changing the model name — confirm against the current listing before purchasing.
About HM Digital
HM Digital makes water-testing instruments — handheld TDS, EC and pH meters and in-line TDS monitors that fit into an RO purifier's tubing. Its Indian store is hmdigital.in.
Service: limitedPrice band: mid
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