---
product_id: 34756289
title: "AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy"
brand: "apera instruments"
price: "₩145963"
currency: KRW
in_stock: true
reviews_count: 10
category: "Apera Instruments"
url: https://www.desertcart.kr/products/34756289-ai209-value-series-ph20-waterproof-ph-tester-kit-0-1
store_origin: KR
region: South Korea
---

# ±0.1 pH accuracy IP67 waterproof rating 2000 hrs battery life AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

**Brand:** apera instruments
**Price:** ₩145963
**Availability:** ✅ In Stock

## Summary

> 💧 Stay sharp, stay ahead — the pH tester that works as hard as you do.

## Quick Answers

- **What is this?** AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy by apera instruments
- **How much does it cost?** ₩145963 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/products/34756289-ai209-value-series-ph20-waterproof-ph-tester-kit-0-1)

## 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

- • **Complete On-the-Go Kit:** Includes rugged carrying case, calibration solutions, and lanyard for professional-grade testing anywhere.
- • **Long-Lasting Performance:** Up to 2000 hours of continuous use on included AAA batteries—ready when you are.
- • **Built to Brave the Elements:** IP67 waterproof design means splash or spill won’t slow you down—test anywhere, anytime.
- • **Effortless Smart Calibration:** Auto buffer recognition and 3-point calibration keep your measurements sharp and hassle-free.
- • **Precision that Powers Confidence:** Ultra-accurate ±0.1 pH readings ensure you never second-guess your water quality.

## Overview

The APERA INSTRUMENTS AI209 PH20 is a professional-grade, waterproof pH tester kit delivering ±0.1 accuracy with auto temperature compensation and smart calibration. Designed for durability and convenience, it offers up to 2000 hours of battery life, comes complete with calibration buffers and a rugged case, and is ideal for hydroponics, water treatment, and environmental monitoring. Certified CE, RoHS, and ISO 9001 compliant, it’s the reliable pocket tool for precise pH measurement wherever your projects take you.

## 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: The perfect pH meter - I love this meter. It’s easy to calibrate. The readings are fast and accurate. It reaches a conclusion quickly and will hold the reading after being removed from the solution. The small refillable jars for calibration solutions make this a great little kit. Perfect for the lab or home enthusiast.

## 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 |
| Age Range (Description) | Adult |
| Batteries | 4 AAA batteries required. (included) |
| Best Sellers Rank | #2,687 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab pH Meters |
| Brand | Apera Instruments |
| Color | Regular Kit |
| Date First Available | April 22, 2016 |
| Display Type | Digital |
| Global Trade Identification Number | 00858718006339 |
| Included Components | PH20 Value pH tester kit |
| Indoor/Outdoor Usage | Outdoor |
| Is Discontinued By Manufacturer | No |
| Item Length | 218 Millimeters |
| Item Weight | 3.9 ounces |
| Item model number | PH20 |
| Lower Temperature Rating | 32 Degrees Fahrenheit |
| Manufacturer | Apera Instruments |
| Model Name | PH20 |
| Number of Batteries | 4 AAA batteries required. (included) |
| Outer Material | Plastic |
| Power Source | Battery Powered |
| Product Care Instructions | Hand Wash Only |
| Reusability | Reusable |
| Special Feature | Waterproof |
| Specification Met | CE, ISO 9001, RoHS |
| Style | Regular Kit |
| UPC | 858718006339 |
| Unit Count | 1.0 Count |
| Upper Temperature Rating | 50 Degrees Celsius |

## 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

![AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy - Image 1](https://m.media-amazon.com/images/I/71ewDi82t5L.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.

### ⭐⭐⭐⭐⭐ The perfect pH meter
*by M***R on January 3, 2026*

I love this meter. It’s easy to calibrate. The readings are fast and accurate. It reaches a conclusion quickly and will hold the reading after being removed from the solution. The small refillable jars for calibration solutions make this a great little kit. Perfect for the lab or home enthusiast.

### ⭐⭐⭐⭐⭐ 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

- APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy
- General Hydroponics pH Control Kit For A Balanced Nutrient Solution
- Apera Instruments AI213 Value Series TDS20 Waterproof TDS Pocket Tester kit, Accuracy: ±1% F.S, 2-Point Auto. Calibration

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*Product available on Desertcart South Korea*
*Store origin: KR*
*Last updated: 2026-03-01*