---
product_id: 231974651
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 (Yellow)"
brand: "ruolan"
price: "€ 19.55"
currency: EUR
in_stock: true
reviews_count: 10
category: "Ruolan"
url: https://www.desertcart.es/products/231974651-ph-meter-for-water-hydroponics-digital-ph-tester-pen-0
store_origin: ES
region: Spain
---

# 0.01 pH precision Long-lasting CR2 battery Auto temperature compensation 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 (Yellow)

**Brand:** ruolan
**Price:** € 19.55
**Availability:** ✅ In Stock

## Summary

> 💧 Master your water’s pH like a pro—because precision is the new power.

## 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 (Yellow) by ruolan
- **How much does it cost?** € 19.55 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/231974651-ph-meter-for-water-hydroponics-digital-ph-tester-pen-0)

## Best For

- ruolan enthusiasts

## Why This Product

- Trusted ruolan brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact & Travel-Ready:** Slim, lightweight design fits in your pocket—take your water quality expert anywhere.
- • **Effortless Calibration:** Comes with calibration powders and simple 3-point calibration for trusted results every time.
- • **Versatile Water Testing:** Perfect for hydroponics, aquariums, pools, RO systems, and drinking water—one tool for all your pH needs.
- • **Smart Temperature Compensation:** Automatically adjusts readings based on water temperature, eliminating guesswork.
- • **Lab-Grade Accuracy in Your Pocket:** Ultra-precise 0.01 pH resolution for flawless water quality control.

## Overview

This digital pH meter delivers lab-level accuracy with 0.01 resolution across a full 0-14 pH range. Featuring automatic temperature compensation and easy 3-point calibration with included powders, it ensures reliable readings for hydroponics, aquariums, pools, and drinking water. Its compact, pocket-sized design and bright display make it the ultimate on-the-go water quality tool for professionals and enthusiasts alike.

## Description

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 (Yellow): desertcart.com: Industrial & Scientific

Review: A necessity for maintaining proper pH values in water. - This item is necessary to maintain proper pH levels in the water. This water is utilized for feeding the plants which are highly sensitive to high pH values. I have actually recommended this item for purchase to another individual and he to agrees that this is a very good product.
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.

## 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
- 【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 |
|---------------|-------|
| ASIN | B08HLXBBK4 |
| Batteries | 1 CR2 batteries required. |
| Best Sellers Rank | #2,552 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab pH Meters |
| Date First Available | September 7, 2020 |
| Item Weight | 3.52 ounces |
| Manufacturer | Ruolan |
| Package Dimensions | 6.85 x 2.13 x 1.26 inches |

## 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 (Yellow) - Image 1](https://m.media-amazon.com/images/I/61BUiZjq72L.jpg)

## Questions & Answers

**Q: How do I get warranty support? I have had this for 3 months and it quit working, just shows zero with an occasional flash of random numbers.**
A: It's the horrible design in the battery tray.  The pressure that keeps the metal contacts down also lifts the entire battery tray away from it's case making it lose contact.  You can try to press them back but it will only happen again.

**Q: can i get more Calibration powder?**
A: Yes, available on Amazon. I use liquid ph 7 which I think is more economical and much simpler to use.

**Q: where are the batteries?  it says included. are they installed inside?  Mine won't turn on**
A: Yes they are installed. They are most likely dead, both meters I received came with dead batteries. The thin black cap comes off if the push in the release on the back and pull it up.

**Q: Can this be used to test the pH of automotive coolant in your radiator??**
A: Yes. It’s a general liquid ph meter

## Customer Reviews

### ⭐⭐⭐⭐⭐ A necessity for maintaining proper pH values in water.
*by B***. on December 11, 2025*

This item is necessary to maintain proper pH levels in the water. This water is utilized for feeding the plants which are highly sensitive to high pH values. I have actually recommended this item for purchase to another individual and he to agrees that this is a very good product.

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐ Recommend for students that need it for schoolwork
*by J***O on December 12, 2025*

Definitely think it should have arrived with more solution calibration packets. I feel it was a little difficult to use at times. The meter would simply turn off after a while. It would do it even while using it to test the ph of a solution. Made it a little more time consuming to have to turn it back on and recalibrate it. It is fairly small which makes it easy to store. Purchased it to do schoolwork for a chemistry class. When comparing my results to the ones of my teacher, I would say the ph tester is accurate. It works well for the price and amount of chemicals I dipped it into.

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-01-22*