---
product_id: 231974651
title: "Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow)"
brand: "ruolan"
price: "฿980"
currency: THB
in_stock: true
reviews_count: 11
category: "Ruolan"
url: https://www.desertcart.co.th/products/231974651-digital-ph-meter-tester-pen-for-water-pre-calibrated-high
store_origin: TH
region: Thailand
---

# 0.01 pH accuracy 0-14 pH range Pocket-sized portability Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow)

**Brand:** ruolan
**Price:** ฿980
**Availability:** ✅ In Stock

## Summary

> 💧 Master your water’s chemistry anytime, anywhere — because precision is the new power.

## Quick Answers

- **What is this?** Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow) by ruolan
- **How much does it cost?** ฿980 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/231974651-digital-ph-meter-tester-pen-for-water-pre-calibrated-high)

## 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

- • **Pocket-Sized Power:** Compact, lightweight design fits effortlessly in your pocket for on-the-go testing.
- • **All-in-One pH Range:** Measures full 0-14 pH spectrum—perfect for water, pools, aquariums, and hydroponics.
- • **Smart Calibration Included:** Comes with calibration powders and easy 3-point calibration for reliable, consistent results.
- • **Precision at Your Fingertips:** Ultra-sensitive 0.01 pH resolution for lab-grade accuracy in everyday use.
- • **Temperature-Compensated Readings:** Automatic temperature adjustment ensures accurate pH values regardless of water temperature.

## Overview

The Ruolan Digital pH Meter Pen delivers lab-accurate 0.01 resolution across the full 0-14 pH range in a sleek, pocket-sized design. Equipped with automatic temperature compensation and easy 3-point calibration using included powders, it’s ideal for hydroponics, aquariums, pools, and household water testing. Lightweight and portable, it empowers professionals and enthusiasts alike to monitor water quality with confidence wherever they go.

## Description

Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow): desertcart.com: Industrial & Scientific

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: Aquarium and House Plants--Water Testing - This is my third pH meter from a different manufacturer and happy that I took the chance to try this out. All three meters that I have bought have different maintenance instructions. I've been comparing them to find out what works best. The Apera brand has better instructions that are easy to understand and seems to work best. But it costs significantly more. This Roulan is the least expensive brand that I could find. Yet it functions acceptably.

## Features

- 【Pre-Calibrated for Immediate Use】The pH meter is pre-calibrated before shipment and can be used directly out of the box. For best accuracy, readings may vary slightly depending on water conditions and environment.
- 【High Accuracy & Wide Measurement Range】Measures pH values from 0 to 14 with high accuracy (±0.01 under standard conditions). Provides stable and reliable readings for daily water testing.
- 【Easy Operation】Simply turn on the device, immerse the probe into the solution, gently stir, and wait for the reading to stabilize before recording the result.
- 【Compact & Portable Design】Pocket-size design allows easy carrying for testing anytime, anywhere. Suitable for home, travel, and outdoor use.
- 【Multi-Purpose Water Testing】Ideal for drinking water, swimming pools, aquariums, hydroponics, RO systems, and other environments requiring pH monitoring.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08HLXBBK4 |
| Batteries | 1 CR2 batteries required. |
| Best Sellers Rank | #1,136 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

![Digital pH Meter Tester Pen for Water, Pre-Calibrated, High Accuracy ±0.01, 0–14 pH Range, Pocket Size for Drinking Water, Pool, Aquarium & Hydroponics (Yellow) - Image 1](https://m.media-amazon.com/images/I/61BUiZjq72L.jpg)

## Available Options

This product comes in different **Color, Size, Number Of Items** options.

## 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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Aquarium and House Plants--Water Testing
*by P***L on March 25, 2026*

This is my third pH meter from a different manufacturer and happy that I took the chance to try this out. All three meters that I have bought have different maintenance instructions. I've been comparing them to find out what works best. The Apera brand has better instructions that are easy to understand and seems to work best. But it costs significantly more. This Roulan is the least expensive brand that I could find. Yet it functions acceptably.

### ⭐⭐⭐⭐ 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.

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-04-25*