---
product_id: 48028052
title: "HM Digital DM-1 in-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy"
brand: "hm digital"
price: "309 Lei"
currency: RON
in_stock: true
url: https://www.desertcart.ro/products/48028052-hm-digital-dm-1-in-line-dual-tds-monitor-0
store_origin: RO
region: Romania
---

# 0-9990 ppm Range Auto-Off Feature +/- 2% Accuracy HM Digital DM-1 in-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy

**Brand:** hm digital
**Price:** 309 Lei
**Availability:** ✅ In Stock

## Summary

> 💧 Stay Ahead of the Curve with Precision Water Monitoring!

## Quick Answers

- **What is this?** HM Digital DM-1 in-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy by hm digital
- **How much does it cost?** 309 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/48028052-hm-digital-dm-1-in-line-dual-tds-monitor-0)

## Best For

- hm digital enthusiasts

## Why This Product

- Trusted hm digital brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Design:** Sleek dimensions fit seamlessly into any water filtration system.
- • **Dual TDS Monitoring:** Simultaneously measure feed and product water quality.
- • **Precision Engineering:** Experience +/- 2% accuracy for reliable readings.
- • **Smart Power Management:** Auto-Off function saves battery life for long-term use.
- • **Effortless Installation:** Quick and easy setup for immediate use.

## Overview

The DM-1 in-Line Dual TDS Monitor is a cutting-edge device designed to measure the total dissolved solids (TDS) levels in both incoming tap water and outgoing purified water. With a range of 0-9990 ppm and an impressive accuracy of +/- 2%, this monitor ensures you have precise data at your fingertips. Its advanced microprocessor technology guarantees efficiency, while the auto-off feature conserves battery life. Compact and easy to install, the DM-1 is the perfect addition to any water filtration system.

## Description

HM Digital DM-1 in-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy

## Features

- The DM-1 helps you to measure the tap water coming in vs the purified water going out of your water filtration system at any time
- The In-Line Dual TDS Meter displays TDS levels of the feed water and product water with in and out electrode probes
- This TDS Monitor is highly efficient and accurate due to its advanced microprocessor technology
- Highly efficient and accurate due to its advanced microprocessor technology
- Auto-Off function conserves battery power. The unit shuts off automatically after 10 minutes of non-use
- Installs quickly and easily

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 4.83 x 2.03 x 7.62 cm; 45.36 g |
| Part number | DM-1 |
| Item display height | 0.8 inches |
| Item display length | 3 inches |
| Item display width | 3 inches |
| Item display weight | 79 g |
| Material type | Plastic |
| Power source type | Battery Powered |
| Manufacturer | HM Digital, Inc. |
| Item model number | 716186 |
| ASIN | B001EHAZGW |

## Product Details

- **Brand:** HM Digital
- **Material:** Plastic
- **Product dimensions:** 48L x 20W millimetres
- **Measurement accuracy:** 2%
- **Number of batteries:** 2 LR44 batteries required. (included)

## Images

![HM Digital DM-1 in-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy - Image 1](https://m.media-amazon.com/images/I/61BTf3o7vqL.jpg)

## Available Options

This product comes in different **Colour Name** options.

## Questions & Answers

**Q: Can i use this in the sump of my aquarium rack, by just mounting the sensors in the water in the sump? ie not inline in an ro/hma system?**
A: There are 2 problems. The sensors are calibrated to be used as advised and in open water they will give much higher readings as well as having the uncertainty of their durability. The latter issue is not a short term problem as they are just 2 probes on the end of a pair of wires. It all depends on what you want to achieve.

**Q: Tds meter should 2 digit result. should this be 3 digit? e.g 000ppm ??**
A: Its a 3 digit readout on an instrument with 2% accuracy.
Do not confuse accuracy and precision. 
Accuracy is how close to the correct result is it?
2% is 2 parts in 100, so some of second digit and all the third digit are wasted. It can determine only 50 TDS steps.
Precision is what does it display?
The display has 1000 steps, so its very precise. That is 0.1% precision.

**Q: I have an RO unit with a post filter to reinstate minerals, should this be installed before the post filter? Or will readings be affected?**
A: I have mine after the water comes out of to unit I think if you put post filter all minerals could be filtered out

**Q: Trying to recalibrate while disconnected from RO unit but the in and out probes give different readings, why?**
A: The probes have to be in the pipe to read. They will not give a “correct” reading if pulled out of and say placed in a cup. You would need to use the T connectors and loop a piece of pipe around

## Frequently Bought Together

- HM Digital DM-1 In-Line Dual TDS Monitor, 0-9990 ppm Range, +/- 2% Readout Accuracy,Blue & White
- Aquatic Life 4-Stage Reverse Osmosis Deionization Water Filter System RO/DI Filtration Unit with Carbon Plus Cartridge, 100 GPD
- 1/4 inch Tube Float Valve Kit for RO Water Reverse Osmosis System water filter Push in to Connect Pipe Hose Tube Fittings CCK tube（ball valve +L+15 feet pipe） (blue)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-01-23*