--- product_id: 249196335 title: "blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ" brand: "hm digital" price: "S$27" currency: SGD in_stock: true reviews_count: 13 category: "Hm Digital" url: https://www.desertcart.sg/products/249196335-blue-0-9990-ppm-measurement-range-1-ppm-resolution-3 store_origin: SG region: Singapore --- # 3% readout accuracy 0-9990 ppm range 1000 hrs battery life blue 0-9990 ppm Measurement Range, 1 ppm Resolution, 3% Readout Accuracy, TDS-EZ Water Quality TDS Tester, TDS-EZ **Brand:** hm digital **Price:** S$27 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead of water quality—because pure water is the new luxury. ## Quick Answers - **What is this?** 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?** S$27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/249196335-blue-0-9990-ppm-measurement-range-1-ppm-resolution-3) ## 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 - • **Durable & Stylish:** Translucent blue, rugged housing combines modern aesthetics with long-lasting durability for everyday use. - • **User-Friendly Design:** Large, easy-to-read LCD screen with hold function to save measurements for effortless recording and analysis. - • **Extended Battery Life:** Up to 1000 hours of continuous use powered by included LR44 batteries—reliable performance without frequent replacements. - • **Smart Power Management:** Auto-off feature conserves battery by shutting down after 10 minutes of inactivity—eco-conscious and efficient. - • **Precision at Your Fingertips:** Advanced microprocessor tech delivers accurate TDS readings with 3% accuracy for confident water quality checks. ## Overview The HM Digital TDS-EZ is a compact, highly accurate water quality tester with a broad 0-9990 ppm measurement range and 1 ppm resolution. Featuring a large LCD, hold function, and auto-off power saving, it offers up to 1000 hours of battery life powered by included LR44 cells. Its durable translucent blue casing and easy recalibration make it an essential tool for professionals and enthusiasts monitoring water purity in filtration, hydroponics, aquariums, and more. ## 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 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 | | ASIN | B002C0A7ZY | | Batteries | 2 LR44 batteries required. (included) | | Brand Name | HM Digital | | Capacity | 9999 Picoliters | | Color | blue | | Customer Reviews | 4.4 4.4 out of 5 stars (7,359) | | Customer reviews | 4.4 4.4 out of 5 stars (7,359) | | Date First Available | 7 August 2012 | | Global Trade Identification Number | 00891144000168 | | Included Components | meter | | Is Discontinued By Manufacturer | No | | Item Dimensions | 25 x 32 x 155 millimeters | | Item Type Name | meter | | Item Weight | 2 Ounces | | Item model number | TDS-EZ | | Manufacturer | HM Digital, Inc. | | Manufacturer | HM Digital, Inc. | | Manufacturer Part Number | TDS-EZ | | Material Type | Plastic | | Model Number | TDS-EZ | | Product Dimensions | 2.54 x 3.18 x 15.49 cm; 56.7 g | | 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 ![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 ### ⭐⭐⭐⭐⭐ Review *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.sg/products/249196335-blue-0-9990-ppm-measurement-range-1-ppm-resolution-3](https://www.desertcart.sg/products/249196335-blue-0-9990-ppm-measurement-range-1-ppm-resolution-3) --- *Product available on Desertcart Singapore* *Store origin: SG* *Last updated: 2026-04-25*