---
product_id: 34756289
title: "APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy"
brand: "apera instruments"
price: "€ 108.01"
currency: EUR
in_stock: true
reviews_count: 8
category: "Apera Instruments"
url: https://www.desertcart.gr/products/34756289-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit
store_origin: GR
region: Greece
---

# IP67 waterproof rugged design Auto calibration w/ buffer recognition Auto temperature compensation (32-122°F) APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

**Brand:** apera instruments
**Price:** € 108.01
**Availability:** ✅ In Stock

## Summary

> 📊 Elevate your water testing game with precision and durability you can trust!

## Quick Answers

- **What is this?** APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy by apera instruments
- **How much does it cost?** € 108.01 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/34756289-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit)

## Best For

- apera instruments enthusiasts

## Why This Product

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

## Key Features

- • **Long-Lasting Power:** Up to 2000 hours of continuous operation powered by included AAA batteries—stay testing without interruptions.
- • **Smart Auto Calibration:** Effortless 3-point calibration with buffer recognition ensures professional-grade reliability every time.
- • **Built for Real-World Use:** IP67 waterproof and rugged carrying case keep your tester safe in any environment—work confidently anywhere.
- • **Precision at Your Fingertips:** 0.1 pH accuracy with fast, stable readings—never second-guess your data again.
- • **Temperature-Adapted Accuracy:** Automatic temperature compensation guarantees precise pH readings from 32°F to 122°F, no matter the conditions.

## Overview

The Apera PH20 Value pH Tester is a compact, professional-grade device designed for accurate pH measurement across a wide range of applications including hydroponics, aquariums, and water treatment. Featuring automatic 3-point calibration with buffer recognition, auto temperature compensation (32-122°F), and IP67 waterproof rating, it delivers reliable, fast readings with 0.1 pH accuracy. The kit includes calibration solutions, batteries, and a rugged carrying case, supporting up to 2000 hours of continuous use. Certified CE, RoHS, and ISO 9001:2015, it’s engineered for durability and ease of use, making it an essential tool for professionals and enthusiasts alike.

## Description

Simply the most reliable pocket pH tester with the best value for general-purpose pH testing e.g. hydroponics, horticulture, pools and spas, water treatment, beverage making, education, environmental monitoring, etc. Up to 3 points of Auto. calibration and 0 to 50˚C Auto temperature compensation (ATC), 0. 1 pH Accuracy with 0 to 14. 0 pH measuring range; Auto. recognition and indication of stable values improves repeatability, saving you the trouble of guessing when to manually hold measurement. PH20 comes with a complete kit of premixed calibration solutions (4.00 and 7.00), 4 AAA batteries, and a lanyard all in a portable carrying case. Smart Self-diagnosis, warning of incorrect buffer solutions and incorrect calibrations. IP67 water-resistant. Up to 2000 hours' operation powered by AAA alkaline batteries. The product is CE and RoHS certified, and is manufactured under an ISO 9001: 2015 certified quality system.

Review: dependable and easy-to-use pH tester - One evening after rearranging my little aquarium corner, I spilled my cup of iced tea while checking water parameters — and that’s when I realized I really needed a reliable tester. That’s when Apera PH20 Waterproof pH Tester Kit became part of my setup, and it’s been surprisingly reassuring to use. At first glance it feels like a simple pocket tester, but once you start using it, it’s clear it’s built with quality in mind. The digital display gives me a quick, readable pH value, and the automatic calibration and temperature compensation means I’m not second-guessing readings when I test different tanks or water samples. It’s IP67 waterproof, so splashes (or accidental drops) don’t stress me out when I’m checking water chemistry. I’ve used it on my aquarium water, plant reservoir solutions, and even my tap water tests, and it consistently gives results that match other meters I’ve checked against. The kit arrives with calibration solutions and batteries so you can start using it right away. A couple honest notes: You’ll want to calibrate regularly for best accuracy, especially if you’re using it often. The probe won’t last forever — like most glass probes, if you don’t rinse and store it properly the longevity can be limited. Overall, it’s a dependable and easy-to-use pH tester that’s worth having if you’re checking water quality for aquariums, gardening, hydroponics, or general water checks. Easy setup, solid accuracy for the price point, and the waterproof design make it feel like a tool worth keeping in your gear bag.
Review: Best ph meter yet! - I recently purchased the Apera Instruments AI209 Value Series PH20 Waterproof pH Tester Kit, and it has been an absolute game-changer for my home gardening and aquarium maintenance. It arrived quickly and in perfect condition, thanks to desertcart’s reliable packaging. The box included everything promised: the pH meter, calibration solutions, storage solution, and a detailed manual. Right out of the box, the pH tester felt solid and well-made. The design is compact and ergonomic, making it comfortable to hold and use. Setting it up was straightforward. The instructions were clear, and calibrating the device with the provided solutions was a breeze. It only took a few minutes, and I was ready to start testing. What I love most about this pH tester is its accuracy and consistency. I've used it to test the pH levels in my hydroponic system and aquarium, and the readings have been spot on every time. The device is very responsive, giving me quick results that I can rely on. The backlit display is bright and easy to read, even in low light conditions, which is a nice touch. Another standout feature is its waterproof design. I’ve accidentally splashed it a few times while working with my aquarium, and it’s held up perfectly. It’s reassuring to know that it’s built to withstand such mishaps without compromising its functionality. The automatic temperature compensation is another fantastic feature. It ensures that the pH readings are accurate regardless of the temperature of the liquid being tested. This is particularly useful for my aquarium, where water temperature can vary slightly throughout the day. Battery life seems excellent so far. I’ve used it quite a bit over the past few days, and there’s no sign of it needing a replacement anytime soon. The device also has an automatic shut-off feature to save battery, which is always appreciated. Overall, I’m extremely pleased with the Apera Instruments AI209 pH tester. It’s reliable, easy to use, and very accurate. Whether you’re a home gardener, aquarium enthusiast, or just someone who needs to measure pH levels regularly, this device is a fantastic investment. Highly recommended!

## Features

- Easy auto. calibration with buffer recognition; auto. temp. compensation (ATC) ensures accuracy in various temperatures (32 to 122F)
- Backed by Apera quality pH sensor with low impedance, ensuring high response rate
- Comes in a rugged carrying case with pH 4&7 buffers and a lanyard
- Auto recognition of stable values improves consistency, so you don't have to guess when to manually hold measurement
- Up to 2000 hours' continuous operation, powered by AAA batteries

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01ENFOHN8 |
| Additional Features | Waterproof |
| Age Range Description | Adult |
| Best Sellers Rank | #2,857 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Lab pH Meters |
| Brand Name | Apera Instruments |
| Color | Regular Kit |
| Customer Reviews | 4.4 4.4 out of 5 stars (9,585) |
| Display Type | Digital |
| Global Trade Identification Number | 00858718006339 |
| Included Components | PH20 Value pH tester kit |
| Indoor Outdoor Usage | Outdoor |
| Item Length | 218 Millimeters |
| Item Weight | 3.9 Ounces |
| LowerTemperature Range | 32 Degrees Fahrenheit |
| Manufacturer | Apera Instruments |
| Model | PH20 |
| Model Name | PH20 |
| Number of Batteries | 4 AAA batteries required. (included) |
| Outer Material | Plastic |
| Part Number | AI209 |
| Power Source | Battery Powered |
| Product Care Instructions | Hand Wash Only |
| Reusability | Reusable |
| Specification Met | CE, ISO 9001, RoHS |
| Style Name | Regular Kit |
| UPC | 858718006339 |
| Unit Count | 1.0 Count |
| Upper Temperature Range | 50 Degrees Celsius |
| Warranty Description | Two-Year limited warranty for the instrument, Six-Month limited warranty for the electrode(s). |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** Apera Instruments
- **Color:** Regular Kit
- **Display Type:** Digital
- **Included Components:** PH20 Value pH tester kit
- **Outer Material:** Plastic
- **Product Care Instructions:** Hand Wash Only
- **Special Feature:** Waterproof
- **Specification Met:** CE, ISO 9001, RoHS
- **Unit Count:** 1.0 Count

## Images

![APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy - Image 1](https://m.media-amazon.com/images/I/71ewDi82t5L.jpg)
![APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy - Image 2](https://m.media-amazon.com/images/I/71d7RKN4TTL.jpg)
![APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy - Image 3](https://m.media-amazon.com/images/I/61XSnepE-AL.jpg)
![APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy - Image 4](https://m.media-amazon.com/images/I/91tmtx9FnpL.jpg)
![APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy - Image 5](https://m.media-amazon.com/images/I/71HW6U9SESL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: How often does this pH meter need to be re-calibrated and/or how can I tell when it needs to be re-calibrated?**
A: The manufacturer recommends keeping the device probe in a neutral storage solution; the protective tip case/container actually has a 'fill' line for guidance, and it is designed to hold a liquid safely when stored as indicated -- If someone uses distilled or deionized water by itself as a storage solution, the salts contained in the probe tip will dissipate and the probe will then need to be replaced--about $25, plus a fine headache trying to get it right. If you are out of storage solution keeping the probe wet somehow is better than dry--but don't store without the specialized solution for more than a day or so; these are typically $10-$13 for 100ml - 250ml size bottles on Amazon.

**Q: Can anyone confirm if this comes pre calibrated?**
A: Mine was, the PH20 unit. Dead on, but I still did the cal to know how. If you use it for pH 8.0 or lower, the 4.00 and 7.00 solutions are perfect-no need for 10.00 test buffer solution. I am AMAZED at how bad my cheapy meters are, and how they disagree with each other and this one.

**Q: Can this be used to analyze urine?**
A: Yes, it can tests urine with no problem. You can use the probe cap as a container for the urine.

**Q: I will be using this meter once a month. Do I need storage solution for the probe?**
A: Storing the probe in the storage solution helps keep the probe's sensitivity and accuracy. So it's a recommended practice. While storing the probe without any solution will not damage the probe, it's just going to cause the probe to lose its sensitivity and accuracy temporarily. Store the probe in the storage solution again for about 10 minutes, the sensitivity and accuracy can be restored.

## Customer Reviews

### ⭐⭐⭐⭐⭐ dependable and easy-to-use pH tester
*by S***M on February 23, 2026*

One evening after rearranging my little aquarium corner, I spilled my cup of iced tea while checking water parameters — and that’s when I realized I really needed a reliable tester. That’s when Apera PH20 Waterproof pH Tester Kit became part of my setup, and it’s been surprisingly reassuring to use. At first glance it feels like a simple pocket tester, but once you start using it, it’s clear it’s built with quality in mind. The digital display gives me a quick, readable pH value, and the automatic calibration and temperature compensation means I’m not second-guessing readings when I test different tanks or water samples. It’s IP67 waterproof, so splashes (or accidental drops) don’t stress me out when I’m checking water chemistry. I’ve used it on my aquarium water, plant reservoir solutions, and even my tap water tests, and it consistently gives results that match other meters I’ve checked against. The kit arrives with calibration solutions and batteries so you can start using it right away. A couple honest notes: You’ll want to calibrate regularly for best accuracy, especially if you’re using it often. The probe won’t last forever — like most glass probes, if you don’t rinse and store it properly the longevity can be limited. Overall, it’s a dependable and easy-to-use pH tester that’s worth having if you’re checking water quality for aquariums, gardening, hydroponics, or general water checks. Easy setup, solid accuracy for the price point, and the waterproof design make it feel like a tool worth keeping in your gear bag.

### ⭐⭐⭐⭐⭐ Best ph meter yet!
*by R***K on June 21, 2024*

I recently purchased the Apera Instruments AI209 Value Series PH20 Waterproof pH Tester Kit, and it has been an absolute game-changer for my home gardening and aquarium maintenance. It arrived quickly and in perfect condition, thanks to Amazon’s reliable packaging. The box included everything promised: the pH meter, calibration solutions, storage solution, and a detailed manual. Right out of the box, the pH tester felt solid and well-made. The design is compact and ergonomic, making it comfortable to hold and use. Setting it up was straightforward. The instructions were clear, and calibrating the device with the provided solutions was a breeze. It only took a few minutes, and I was ready to start testing. What I love most about this pH tester is its accuracy and consistency. I've used it to test the pH levels in my hydroponic system and aquarium, and the readings have been spot on every time. The device is very responsive, giving me quick results that I can rely on. The backlit display is bright and easy to read, even in low light conditions, which is a nice touch. Another standout feature is its waterproof design. I’ve accidentally splashed it a few times while working with my aquarium, and it’s held up perfectly. It’s reassuring to know that it’s built to withstand such mishaps without compromising its functionality. The automatic temperature compensation is another fantastic feature. It ensures that the pH readings are accurate regardless of the temperature of the liquid being tested. This is particularly useful for my aquarium, where water temperature can vary slightly throughout the day. Battery life seems excellent so far. I’ve used it quite a bit over the past few days, and there’s no sign of it needing a replacement anytime soon. The device also has an automatic shut-off feature to save battery, which is always appreciated. Overall, I’m extremely pleased with the Apera Instruments AI209 pH tester. It’s reliable, easy to use, and very accurate. Whether you’re a home gardener, aquarium enthusiast, or just someone who needs to measure pH levels regularly, this device is a fantastic investment. Highly recommended!

### ⭐⭐⭐⭐⭐ Easy to use, calibrate, and clean.
*by N***N on December 8, 2025*

I use this for mead making where pH is an important factor for recipe development at different stages of the process. It’s easy to use, easy to calibrate, easy to read, and easy to clean. Great value for what seems to be a reliable, lab quality product.

## Frequently Bought Together

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*Product available on Desertcart Greece*
*Store origin: GR*
*Last updated: 2026-03-24*