---
product_id: 393708792
title: "TRM-1, 3X 1/4\" Tee, Triple Inline TDS PPM Monitor/Meter"
brand: "hm digital"
price: "€ 1.86"
currency: EUR
in_stock: false
url: https://www.desertcart.fi/products/393708792-trm-1-3x-1-4-tee-triple-inline-tds-ppm
store_origin: FI
region: Finland
---

# Lightweight 108g plastic build Precise TDS & PPM monitoring 3X 1/4" Tee inline design TRM-1, 3X 1/4" Tee, Triple Inline TDS PPM Monitor/Meter

**Brand:** hm digital
**Price:** € 1.86
**Availability:** ❌ Out of Stock

## Summary

> 💧 Stay sharp, stay pure — monitor your water like a pro!

## Quick Answers

- **What is this?** TRM-1, 3X 1/4" Tee, Triple Inline TDS PPM Monitor/Meter by hm digital
- **How much does it cost?** € 1.86 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/393708792-trm-1-3x-1-4-tee-triple-inline-tds-ppm)

## 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

- • **No Batteries Needed:** Hassle-free operation with zero maintenance downtime
- • **Compact & Lightweight:** Easy to install without adding bulk or weight to your setup
- • **Triple Inline Tee Design:** Seamlessly integrates into your water system for real-time monitoring
- • **Durable Plastic Construction:** Engineered for longevity and consistent performance
- • **Accurate TDS & PPM Measurement:** Stay ahead with precise water quality data at your fingertips

## Overview

The TRM-1 by HM Digital is a compact, triple inline 1/4" tee designed for precise Total Dissolved Solids (TDS) and Parts Per Million (PPM) water quality monitoring. Crafted from durable plastic and weighing just 108 grams, it offers easy integration into water systems without the need for batteries, ensuring reliable, maintenance-free performance.

## Description

HM Digital TRM-1 Triple Inline TDS PPM Monitor with 3 x 1/4" Tee Fittings. TDS monitor that is ideal for checking TDS levels at 3 points, such as with DI/RO (deionization / reverse osmosis), or multiple points in an RO system, and more. FEATURES Displays TDS levels of the three sensing points with electrode probes. 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. Dual Range 0-9990 ppm (From 0 - 999 ppm the resolution is 1 ppm. From 1000 to 9990 ppm, the resolution is 10 ppm, indicated by a blinking 'x10' image.) Factory Calibrated: calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. SPECIFICATIONS Range: 0-9990 ppm Accuracy: ±2% Conversion Factor: NaCl (avg. 0.5) Cable Length: 24.5" (including sensor) Fittings: 1/4" standard, Power source: 2 x 1.5V button cell batteries (LR44 or equivalent; included) Size: 7.6 x 2 x 4.7 cm (3 x .8 x 1.9 in.) Weight: 79.4 g (2.8 oz.)

## Features

- manufacturer: HM Digital
- Item Trademark: HM DIGITAL
- material: Plastic

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Material Type | Plastic |
| Batteries Included? | No |
| Brand | HM Digital |
| Manufacturer | HM Digital |
| Manufacturer reference | 4316344533 |
| Package Dimensions | 14.6 x 11 x 3.1 cm; 108 g |
| ASIN | B019VIVVVS |

## Images

![TRM-1, 3X 1/4" Tee, Triple Inline TDS PPM Monitor/Meter - Image 1](https://m.media-amazon.com/images/I/61SqKWPoIPL.jpg)

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.fi/products/393708792-trm-1-3x-1-4-tee-triple-inline-tds-ppm](https://www.desertcart.fi/products/393708792-trm-1-3x-1-4-tee-triple-inline-tds-ppm)

---

*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-02-15*