--- product_id: 249196335 title: "HM Digital blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ" brand: "hm digital" price: "536 kr" currency: NOK in_stock: true reviews_count: 13 category: "Hm Digital" url: https://www.desertcart.no/products/249196335-hm-digital-blue-0-9990-ppm-measurement-range-1-ppm store_origin: NO region: Norway --- # 3% readout accuracy 1000 hrs battery life 0-9990 ppm range HM Digital blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ **Brand:** hm digital **Price:** 536 kr **Availability:** ✅ In Stock ## Summary > 💧 Measure purity, master quality — never settle for less! ## Quick Answers - **What is this?** HM Digital blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ by hm digital - **How much does it cost?** 536 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/249196335-hm-digital-blue-0-9990-ppm-measurement-range-1-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 - • **Smart Auto-Off:** Conserves battery by shutting off after 10 minutes of inactivity—efficiency meets convenience. - • **Durable & Stylish:** Translucent blue, rugged housing built to withstand daily use while turning heads. - • **User-Friendly Design:** Large, easy-to-read LCD with hold function for effortless measurement recording on the go. - • **Extended Battery Life:** Up to 1000 hours of continuous use powered by included LR44 button cells—stay powered longer. - • **Precision at Your Fingertips:** Advanced microprocessor tech delivers ultra-accurate TDS readings with 3% accuracy. ## Overview The HM Digital TDS-EZ is a sleek, reliable water quality tester offering a broad 0-9990 ppm measurement range with 1 ppm resolution and 3% accuracy. Featuring a large LCD, hold function, and smart auto-off, it ensures precise, convenient readings for professionals managing water purity in filtration, hydroponics, aquariums, and more. Its durable translucent blue casing and long-lasting battery make it a must-have tool for anyone serious about water quality. ## Description Product Description: A TDS meter (aka ppm pen, nutrient tester, tds stick) is an inexpensive and convenient digital tool to instantly check your overall water quality. TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water. With the push of a button, the TDS-EZ can tell you your overall water purity level, which will be displayed on the screen in ppm (parts per million). The lower the TDS level, the purer the water, with 0 ppm being pure H2O. The TDS-EZ is great for checking your tap water quality, or knowing when to change a filter. (The meter does not test for biological contaminants.) The TDS-EZ is a great tool for drinking water, water filtration and purification, hydroponics (test your nutrients), aquariums, RO/DI systems, pools and spas, and more. Review: ممتاز - ممتاز الجهاز ويقس نقاوة الماء صح 👌🏽 Review: Very high quality! - Tested this straight from the package inside a 342ppm fluid solution,and got it right straightaway without any calibration.Also it has the ability to calibrate using a screw driver,unlike many other tds pen out there. ## Features - Economy model that is ideal for end-users. Highly efficient and accurate due to its advanced microprocessor technology. - Hold Function: saves measurements for convenient reading and recording and battery life is approx. 1000 hours of usage and power source is 2 x 1.5V button cell batteries (included) (LR44 or equivalent) - Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries. Display: large and easy-to-read LCD screen. - Measurement Range: 0-9990 ppm. From 0-999 ppm, the resolution is in increments of 1ppm. From 1000 to 9990 ppm, the resolution is in increments of 10ppm, indicated by a blinking 'x10' image. Fun, translucent blue housing that's very strong and durable. - TDS-EZ meters are calibrated with a 342 ppm NaCl solution. Meters can be recalibrated with a mini-screwdriver. Includes a TDS chart sticker on the back of the meter that explains TDS values. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B002C0A7ZY | | Best Sellers Rank | #18,554 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Digital Calipers | | Brand | HM Digital | | Brand Name | HM Digital | | Capacity | 9999 picoliters | | Color | blue | | Colour | blue | | Country of Publication | China | | Customer Reviews | 4.4 out of 5 stars 7,379 Reviews | | Global Trade Identification Number | 00891144000168 | | Included Components | meter | | Item Dimensions | 25 x 32 x 155 millimeters | | Item Type Name | meter | | Item dimensions L x W x H | 25 x 32 x 155 millimeters | | Manufacturer | HM Digital, Inc. | | Manufacturer Part Number | TDS-EZ | | Material | Plastic | | Material Type | Plastic | | Model Number | TDS-EZ | | Number of Items | 1 | | Size | 0-9990 ppm. Measurement Range | | UPC | 712641079917 891144000168 | | Unit Count | 1 Count | ## Product Details - **Brand:** HM Digital - **Capacity:** 9999 Picoliters - **Colour:** blue - **Item dimensions L x W x H:** 25 x 32 x 155 millimeters - **Material:** Plastic ## Images ![HM Digital blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ - Image 1](https://m.media-amazon.com/images/I/51bkCzLQm9L.jpg) ## Questions & Answers **Q: How many times can the tester be used?** A: FROM HM DIGITAL: Unlimited. Eventually, you will need new batteries, but the TDS-EZ can be used an unlimited number of times. **Q: What temperature was this device calibrated at? I noticed that readings vary with temperature. How do I get a consistent reading?** A: FROM HM DIGITAL: The TDS-EZ was calibrated at 25 degrees Celsius (77F), but more importantly, the TDS-EZ is one of HM Digital's most basic meters and does not have Automatic Temperature Compensation (ATC). Therefore, since it does not have ATC, you will see discrepancies when testing hotter or colder from the baseline of 25C/77F.If your water is typically around this temperature, it won't be much of a difference, but if +/-10 degrees or more from 25C/77F, it's a good idea to get a meter with ATC, such as HM Digital's TDS-3, TDS-4, AP-1, COM-80 or COM-100. **Q: can the battery be replaced? if so, what battery does it take?** A: Yes, the batteries can be replaced. It takes 2 LR44G "button cell" batteries like the batteries that go in watches, ect. The unit has an auto shut-off so the batteries should last a good long time. **Q: Can this be used to check for collodial silver in the 10 ppm range in a solution of distilled water?** A: No it can't. It doesn't detect specific elements or chemicals. Though the way calcium, lead, and collodial silver may dissolve would effect the numerical value of TDS and if you knew that in 100 ml of 45 deg Celsius water would only hold X# ppm of an element you might be able to figure it out based on the numerical value shown. ## Customer Reviews ### ⭐⭐⭐⭐⭐ ممتاز *by ر***ة on 6 April 2024* ممتاز الجهاز ويقس نقاوة الماء صح 👌🏽 ### ⭐⭐⭐⭐⭐ Very high quality! *by A***I on 7 August 2020* Tested this straight from the package inside a 342ppm fluid solution,and got it right straightaway without any calibration.Also it has the ability to calibrate using a screw driver,unlike many other tds pen out there. ### ⭐⭐⭐⭐ good one *by A***F on 12 June 2021* very useful to detect purity of water ## Frequently Bought Together - HM Digital TDS-EZ Water Quality TDS Tester, 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy,Purple - HM Digital C342 TDS and EC Calibration Solution, 342 ppm (NaCl), 90 ml Volume, Transparent/Blue - HoneForest Water Quality Tester, Accurate and Reliable, TDS Meter, EC Meter & Temperature Meter 3 in 1, 0-9990ppm, Ideal Water Test Meter for Drinking Water, Aquariums, etc. --- ## 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.no/products/249196335-hm-digital-blue-0-9990-ppm-measurement-range-1-ppm](https://www.desertcart.no/products/249196335-hm-digital-blue-0-9990-ppm-measurement-range-1-ppm) --- *Product available on Desertcart Norway* *Store origin: NO* *Last updated: 2026-09-17*