---
product_id: 34756289
title: "APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy"
brand: "apera instruments"
price: "€ 112.94"
currency: EUR
in_stock: true
category: "Apera Instruments"
url: https://www.desertcart.pt/products/34756289-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit
store_origin: PT
region: Portugal
---

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

**Brand:** apera instruments
**Price:** € 112.94
**Availability:** ✅ In Stock

## Summary

> 💼 Elevate your precision game with the pH tester that works as hard as you do.

## 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?** € 112.94 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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 use powered by included AAA batteries—stay productive longer.
- • **Effortless Calibration:** Auto buffer recognition and 3-point calibration keep you on point without the hassle.
- • **Smart Stability Detection:** Auto recognition of stable values eliminates guesswork, ensuring consistent, reliable measurements.
- • **Built to Brave the Elements:** IP67 waterproof design means no fear of spills or outdoor use.
- • **Precision at Your Fingertips:** Ultra-accurate ±0.1 pH readings for flawless results every time.

## Overview

The APERA INSTRUMENTS AI209 PH20 is a rugged, waterproof pH tester kit delivering lab-grade ±0.1 accuracy with auto temperature compensation and buffer recognition. Designed for professionals in hydroponics, water treatment, and environmental monitoring, it offers up to 2000 hours of battery life, quick 5-second response, and smart stability detection—all packed in a portable case with calibration solutions and accessories.

## 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.

## 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 | #4,592 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Lab pH Meters |
| Brand Name | Apera Instruments |
| Color | Regular Kit |
| Customer Reviews | 4.4 4.4 out of 5 stars (8,906) |
| Display Type | Digital |
| Global Trade Identification Number | 00858718006339 |
| Immersion Depth | 1 inches |
| Included Components | PH20 Value pH tester kit |
| Indoor Outdoor Usage | Outdoor |
| Item Length | 21.8 centimeters |
| Item Weight | 3.9 ounces |
| LowerTemperature Range | 32 °F |
| Manufacturer | Apera Instruments |
| Model | AI209 |
| 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 |
| Response Time | 5 seconds |
| Reusability | Reusable |
| Specification Met | CE, ISO 9001, RoHS |
| Style Name | Regular Kit |
| UPC | 858718006339 |
| Unit Count | 1 Count |
| Upper Temperature Range | 50 °C |
| 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 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)

## 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.

## 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

---

## 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.pt/products/34756289-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit](https://www.desertcart.pt/products/34756289-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit)

---

*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-10-12*