---
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: "€ 20.62"
currency: EUR
in_stock: true
category: "Ruolan"
url: https://www.desertcart.gr/products/231974651-digital-ph-meter-tester-pen-for-water-pre-calibrated-high
store_origin: GR
region: Greece
---

# pocket-size portability ±0.01 high accuracy 0–14 full pH range 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:** € 20.62
**Availability:** ✅ In Stock

## Summary

> 💧 Stay sharp, stay balanced — your water’s pH guardian on the go!

## 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?** € 20.62 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/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

- • **Compact Powerhouse:** Sleek pocket-sized design fits your on-the-go lifestyle and professional needs.
- • **Ready When You Are:** Pre-calibrated out of the box—start testing instantly, no setup hassle.
- • **Effortless Calibration:** Easy 3-step calibration with guided instructions keeps your readings razor sharp.
- • **Precision You Can Trust:** Calibrated to ±0.01 for lab-grade accuracy in every sip and splash.
- • **Versatile Water Testing:** Perfect for drinking water, pools, aquariums, hydroponics, and RO systems.

## Overview

This Digital pH Meter Tester Pen offers ultra-precise water pH measurement with ±0.01 accuracy across the full 0–14 range. Pre-calibrated for immediate use and designed in a compact, pocket-friendly form, it’s ideal for professionals and enthusiasts monitoring drinking water, pools, aquariums, and hydroponic systems. Easy calibration and quick readings make it a must-have tool for maintaining optimal water quality anytime, anywhere.

## 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

## Features

- 【Calibration Operation Guide】 Press and hold the CAL button for 5 seconds to access calibration mode. Complete calibration by selecting the standard powders in this exact order: 6.86 → 4 → 9.18. Please refer to our full calibration instructions and tutorial video for detailed steps.
- 【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.
- 【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 | #1,425 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

## 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
- 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.gr/products/231974651-digital-ph-meter-tester-pen-for-water-pre-calibrated-high](https://www.desertcart.gr/products/231974651-digital-ph-meter-tester-pen-for-water-pre-calibrated-high)

---

*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-07-05*