--- product_id: 657285256 title: "PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal)" price: "£17.77" currency: GBP in_stock: true reviews_count: 13 url: https://www.desertcart.co.uk/products/657285256-ph-meter-for-water-hydroponics-digital-ph-tester-pen-0 store_origin: GB region: United Kingdom --- # 0.01 pH precision 0-14 pH range pocket-sized portability PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) **Price:** £17.77 **Availability:** ✅ In Stock ## Summary > 💧 Pocket-sized precision for the water-conscious pro ## Quick Answers - **What is this?** PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) - **How much does it cost?** £17.77 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/657285256-ph-meter-for-water-hydroponics-digital-ph-tester-pen-0) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal pH Range Coverage:** Measures the full 0-14 pH spectrum—perfect for everything from hydroponics to your morning brew. - • **Compact & Travel-Ready Design:** Slim, lightweight, and pocket-sized so you can test water quality anytime, anywhere. - • **Effortless Calibration Included:** Comes with calibration powders and simple 3-point calibration for trusted, consistent results. - • **Lab-Grade Accuracy in Your Pocket:** Ultra-precise 0.01 pH resolution ensures you never second-guess your water quality. - • **Smart Auto Temperature Compensation:** Automatically adjusts readings based on water temperature—science made seamless. ## Overview The Ruolan PH Meter is a high-accuracy digital tester pen offering 0.01 resolution across a full 0-14 pH range. Designed for professionals and enthusiasts alike, it features easy 3-point calibration with included powders, automatic temperature compensation, and a compact, pocket-friendly design. Ideal for hydroponics, aquariums, pools, and drinking water, it delivers lab-grade precision wherever you go. ## Description Product description pH Tester Usage Notes When the pH meter is turned on in the air, the displayed value will fluctuate irregularly, which is normal. The value shown in the air is not for reference. While measuring water with the pH meter, stir the water gently to remove any bubbles attached to the probe. It takes some time for the reading to stabilize, and it’s normal for the value to fluctuate during the process. Do not insert the probe and read the value immediately. If white crystalline salt appears around the pH meter's electrode, this is normal for pH electrodes. To clean it, simply soak the electrode in water and wipe it off. The pH meter’s electrode is made of fragile glass. Avoid dropping it or touching it with your hands. Do not test water above 50°C or strong acids and bases, as they may cause the glass electrode to break. Product Name: 0.01 pH Automatic Calibration Pen Test Item: Water pH Value Working Environment: 0-80°C, RH < 95% M easuring Range: 0.00-14.00 pH A utomatic Temperature Compensation: 0-80°C C alibration Function: Two-Point Automatic Calibration Application Scope: Ideal for water hydroponics, laboratories, pools, industrial water treatment, and water purifiers. How to Use Remove the pen cover and rinse the electrode with pure water. Insert the pen's probe into the solution, ensuring the water level does not exceed the marked limit. Turn on the switch, stir the solution gently, and wait for the reading to stabilize. Once the reading is stable, note the displayed value. After testing, rinse the electrode with pure water, dry the pen tip promptly, and replace the pen cover. Standard configuration： 2XPH Meter 6XCalibration Powder 2XGift Box 2XInstruction Manual Instructions for Use of pH Calibration Powder Precautions Note: Ensure to follow the correct calibration sequence: 6.86 → 4.00 → 9.18 for accurate results. Calibration Powder: A pH standard solid substance that becomes usable after adding water. It is suitable for calibrating any type of pH meter. Each packet requires 250 mL of purified water. Important Notes Use only purified or distilled water to prepare the calibration solution. Do not use tap water or mineral water. Add water in the specified proportion, as incorrect amounts can affect the accuracy of the calibration and increase the margin of error. The prepared calibration solutions should be sealed in clean bottles and stored in a cool, dark place. The shelf life of the calibration powder is 2 years. Once prepared, the calibration solution has a shelf life of 6 months. Matters Needing Attention The pH meter has been calibrated prior to delivery, so buyers do not need to re-calibrate upon receiving the product. However, re-calibration is required in the following cases The meter has been used for an extended period since the last calibration. The electrode has been used frequently in special applications. High measurement accuracy is required. If the backlight brightness drops significantly or the display value is blurred, the battery should be replaced. When replacing the battery, just pull out the battery compartment and replace it. NoteThe polarity of the battery. Review: Handy little ph meter - So I finally got one of these little digital pens to check my water and honestly it has made me feel like a total scientist in my own kitchen. I used to just stare at the tap and wonder if everything was okay but now I can just dip this in and see the numbers pop up right away 💧 It is basically like having a tiny expert living in your drawer who tells you exactly what is going on with your drinks so you dont have to guess anymore. I was actually suprised by how fast it works because I thought it would take ages to get a reading but it is usually done before I can even finish humming a little tune. It is super light and thin too which is great because it doesn't take up any space at all and I can even take it with me when I go to visit my parents 🏠 You just pop the cap off and stick it in the glass and then boom you have all the info you need right there on the screen. I accidentally left the cap off for a few hours once and I was worried I broke it but I just rinsed it off and it kept on working like a total champ. The best part is that the screen is really bright so I can even use it in the morning when I am still half asleep and havent turned all the lights on yet ☀️ I basically just point and click and it handles all the complicated math for me which is perfect since I am definitely not a fan of doing science experiments before I have had my coffee. It fits right in my pocket too so I can even use it to check the water at the gym or when I am out on a long walk in the park. If you are someone who likes to know exactly what is going on with your hydration then this is basically a little dream come true 🥤 Just make sure you keep the sensor clean or you might get some funny readings that make you tilt your head in confusion. I am honestly thinking about getting one for my friend who has a huge aquarium because it is so much easier than those messy drop kits with all the different colors. It is just a fun little tool that makes my daily life feel a lot more organized and I think you would really enjoy how simple it makes everything feel 🌟 It is basically like a magic wand for your water glass which is pretty cool if you think about it. I am very happy with it and I think it is going to stay right next to my favorite mugs for a very long time. Review: Very satisfied - Works great and not complicated ## Features - 【How to use calibration】Press CAL for 5 seconds to enter the calibration mode, press in turn to select the powders corresponding to 6.86, 4, and 9.18 to complete the calibration. - Our products come with calibration powder to verify their accuracy. The instructions on the package indicate that when calibrating the powder step, Distilled water should be added when using the calibration powder. It's just because the calibration powder needs to be mixed with distilled water - 【Mini Size】The mini size ph meter we designed allows you to easily put it in your pocket, so you can take measurements anytime, anywhere. It can help you test it whether you take it to the pool, on a trip, to the beach or camping. - 【Family Essentials】As a tool to improve the quality of life. Can be used to test drinking water, swimming pools, PH balance in aquarium, RO system, spa or hydroponics. Basically all the environments that need to test PH value can use this tester to get accurate data. - 【Easy to use】turn on the switch,put the probe into the water and stir (make the small glass ball fully contact the liquid) and the value can be read when the value is stable. - 【Automatic temperature compensation】There is no need to care about the temperature of the liquid being measured. The PH meter has an automatic temperature compensation function, which can be adjusted according to the water temperature and water quality. ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 3.9 out of 5 stars 11,487 Reviews | ## Images ![PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) - Image 1](https://m.media-amazon.com/images/I/51GClnIKRXL.jpg) ![PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) - Image 2](https://m.media-amazon.com/images/I/71EXD5t+lxL.jpg) ![PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) - Image 3](https://m.media-amazon.com/images/I/71nuMxLcmjL.jpg) ![PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) - Image 4](https://m.media-amazon.com/images/I/812Wf6IQlWL.jpg) ![PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (2, Yellow, Normal) - Image 5](https://m.media-amazon.com/images/I/71scR5OIkgL.jpg) ## Available Options This product comes in different **Color, Size, Number Of Items** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Handy little ph meter *by S***S on December 30, 2025* So I finally got one of these little digital pens to check my water and honestly it has made me feel like a total scientist in my own kitchen. I used to just stare at the tap and wonder if everything was okay but now I can just dip this in and see the numbers pop up right away 💧 It is basically like having a tiny expert living in your drawer who tells you exactly what is going on with your drinks so you dont have to guess anymore. I was actually suprised by how fast it works because I thought it would take ages to get a reading but it is usually done before I can even finish humming a little tune. It is super light and thin too which is great because it doesn't take up any space at all and I can even take it with me when I go to visit my parents 🏠 You just pop the cap off and stick it in the glass and then boom you have all the info you need right there on the screen. I accidentally left the cap off for a few hours once and I was worried I broke it but I just rinsed it off and it kept on working like a total champ. The best part is that the screen is really bright so I can even use it in the morning when I am still half asleep and havent turned all the lights on yet ☀️ I basically just point and click and it handles all the complicated math for me which is perfect since I am definitely not a fan of doing science experiments before I have had my coffee. It fits right in my pocket too so I can even use it to check the water at the gym or when I am out on a long walk in the park. If you are someone who likes to know exactly what is going on with your hydration then this is basically a little dream come true 🥤 Just make sure you keep the sensor clean or you might get some funny readings that make you tilt your head in confusion. I am honestly thinking about getting one for my friend who has a huge aquarium because it is so much easier than those messy drop kits with all the different colors. It is just a fun little tool that makes my daily life feel a lot more organized and I think you would really enjoy how simple it makes everything feel 🌟 It is basically like a magic wand for your water glass which is pretty cool if you think about it. I am very happy with it and I think it is going to stay right next to my favorite mugs for a very long time. ### ⭐⭐⭐⭐⭐ Very satisfied *by S***R on April 30, 2026* Works great and not complicated ### ⭐⭐⭐⭐ Cheap but works *by J***E on December 11, 2025* Works ok for short term use. Loses calibration quickly. Would get 2 or 3 and use them all at the same time for anything sensitive. ## Frequently Bought Together - PH Meter for Water Hydroponics Digital PH Tester Pen 0.01 High Accuracy Pocket Size with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium (pH Meter 2PCS) - General Hydroponics pH Control Kit For A Balanced Nutrient Solution - FoxFarm Fertilizer Soil Trio Liquid Nutrient: Tiger Bloom, Grow Big, Big Bloom Bottles - (Pack of 3-1 Pint) --- ## 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.co.uk/products/657285256-ph-meter-for-water-hydroponics-digital-ph-tester-pen-0](https://www.desertcart.co.uk/products/657285256-ph-meter-for-water-hydroponics-digital-ph-tester-pen-0) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-04*