--- product_id: 49973872 title: "HM Digital TDS-4 Pocket Size TDS Meter" brand: "hm digital" price: "€ 51.35" currency: EUR in_stock: true category: "Hm Digital" url: https://www.desertcart.at/products/49973872-hm-digital-tds-4-pocket-size-tds-meter store_origin: AT region: Austria --- # Ultra-light 34g design 0-9990 ppm range 1000 hrs battery life HM Digital TDS-4 Pocket Size TDS Meter **Brand:** hm digital **Price:** € 51.35 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead of water quality—because your health and hobby deserve precision. ## Quick Answers - **What is this?** HM Digital TDS-4 Pocket Size TDS Meter by hm digital - **How much does it cost?** € 51.35 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/49973872-hm-digital-tds-4-pocket-size-tds-meter) ## 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 - • **Smart Energy Saver:** Auto-off after 10 minutes to maximize battery life and keep you powered longer. - • **Crystal Clear Readings:** Large LCD screen with hold function ensures you never miss a critical measurement. - • **Pocket-Sized Powerhouse:** Smallest and lightest TDS meter on the market—carry confidence everywhere you go. - • **Versatile Water Testing:** Factory calibrated and perfect for aquariums, hydroponics, pools, and drinking water purity. - • **Precision at Your Fingertips:** Measures TDS from 0 to 9990 ppm with fine 1 ppm resolution for pure accuracy. ## Overview The HM Digital TDS-4 is a compact, lightweight Total Dissolved Solids meter designed for precise water quality testing across a wide range of applications. With a measurement range up to 9990 ppm, factory calibration, automatic temperature compensation, and energy-saving auto-off, it’s the go-to tool for professionals and enthusiasts seeking reliable, on-the-go water purity insights. ## Description A TDS tester that's ideal for all water purification applications, drinking water testing, pools & spas, fresh water aquariums, hydroponics, and colloidal silver. Perfect for both consumer or commercial use. Carry one in your pocket at all times! Features The smallest and lightest TDS meter on the market. Sleek design is perfect for personal or consumer use. Advanced microprocessor technology. Hold Function: saves measurements for convenient reading and recording. Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries. Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1 ppm. From 1000 to 9990 ppm, the resolution is in increments of 10 ppm, indicated by a blinking 'x10' image. Display: large and easy-to-read LCD screen. Recommended for fresh water aquariums & aquaculture, horticulture & hydroponics, and pools & spas. Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. Need help deciding which meter is right for you? View our TDS/EC Meter Selection Guide. Specifications Range: 0 - 9990 ppm (mg/L) Resolution: 0-999: 1 ppm; 1000-9990 10 ppm (indicated by a 'x10' icon) Accuracy: +/- 2% EC-to-TDS Conversion Factor: NaCl (avg. 0.5) ATC: Built-in sensor for Automatic Temperature Compensation of 1 to 50 degrees Celsius (33 to 122 degrees Farenheit) Power source: 2 x 1.5V button cell batteries (included) (LR44 or equivalent) Battery life: 1000 hours of usage Dimensions: 14 x 2.3 x 1.5 cm (5.5 x .9 x .55 inches) Weight: 34g (1.2 oz) Power supplied to the unit conforms to current UK Regulations. Standard warranty does not cover any damage caused by power surge or similar. We recommend installing a surge protector. ## Features - 🔹 The TDS-4 is ideal for all water purification applications - 🔹 The smallest and lightest TDS meter on the market & perfect for personal or consumer use - 🔹 Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1 ppm. From 1000 to 9990 ppm, the resolution is in increments of 10 ppm - 🔹 Factory Calibrated: our meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver - 🔹 Recommended for fresh water aquariums & aquaculture, horticulture & hydroponics, and pools & spas. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0041B09PK | | Age Range Description | Adult | | Best Sellers Rank | 193,268 in Pet Supplies ( See Top 100 in Pet Supplies ) 404 in Aquarium Test Kits 6,647 in Scanners & Testers 21,173 in Lawn & Garden Watering Equipment | | Brand | HM Digital | | Customer Reviews | 4.0 4.0 out of 5 stars (28) | | Display Type | LCD | | Included Components | 2 x 1.5V button cell batteries (LR44) | | Item Length | 14 Centimetres | | Manufacturer | HM Digital | | Manufacturer Part Number | TDS-4 | | Model Name | TDS-4 | | Model Number | TDS-4 | | Number of Batteries | 2 LR44 batteries required. | | Outer Material | Plastic | | Power Source | Battery Powered | | Product Care Instructions | Wipe Clean | | Resolution | 0.1 degree | | Response Time | 500 Milliseconds | | Reusability | Single Use | | Special Features | ATC, Auto Off, High Accuracy, Hold Function | | Style Name | Contemporary | | UPC | 891144000182 | | Unit Count | 1 count | | Upper Temperature Rating | 50 Degrees Celsius | ## Product Details - **Age range (description):** Adult - **Brand:** HM Digital - **Display type:** LCD - **Included components:** 2 x 1.5V button cell batteries (LR44) - **Model name:** TDS-4 - **Outer material:** Plastic - **Power source:** Battery Powered - **Product care instructions:** Wipe Clean - **Special feature:** ATC, Auto Off, High Accuracy, Hold Function - **Unit count:** 1 count ## Images ![HM Digital TDS-4 Pocket Size TDS Meter - Image 1](https://m.media-amazon.com/images/I/31I6tOabtaL.jpg) ![HM Digital TDS-4 Pocket Size TDS Meter - Image 2](https://m.media-amazon.com/images/I/51bKRGo1LXL.jpg) ## Questions & Answers **Q: Does this test for safe drinking water ?** A: This is a TDS meter this measure the electrical conductivity of the water. The higher the level of dissolved minerals in the water, the higher the reading it will provide. A reading of 0 would mean the water does not have any mineral content, a reading of 300 would mean the water has a high mineral content. This meter DOES NOT test for bacteria in the water. IT WILL NOT INDICATE if water is safe to drink, as it does not test for bacteria. If you need any further information call help line at Vyair 01507 524576 where we will try and offer technical support. ## Frequently Bought Together - HM Digital TDS-4 Pocket Size TDS Meter - SaltyShrimp Bee shrimp mineral GH+ - HM Digital 342ppm TDS Calibration Solution (a.k.a Water Testing Solution) 3 fl oz (90 ml) --- ## 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.at/products/49973872-hm-digital-tds-4-pocket-size-tds-meter](https://www.desertcart.at/products/49973872-hm-digital-tds-4-pocket-size-tds-meter) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-08-24*