---
product_id: 34756290
title: "APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy"
brand: "apera instruments, llc"
price: "€ 107.85"
currency: EUR
in_stock: true
reviews_count: 6
category: "BISS"
url: https://www.desertcart.fi/products/34756290-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit
store_origin: FI
region: Finland
---

# ±0.1 pH ultra-precise accuracy Auto temperature compensation 32-122°F Waterproof rugged design with carrying case APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

**Brand:** apera instruments, llc
**Price:** € 107.85
**Availability:** ✅ In Stock

## Summary

> ⚡ Stay sharp, measure smarter — never miss the perfect pH!

## Quick Answers

- **What is this?** APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy by apera instruments, llc
- **How much does it cost?** € 107.85 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/34756290-apera-instruments-ai209-value-series-ph20-waterproof-ph-tester-kit)

## Best For

- apera instruments, llc enthusiasts

## Why This Product

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

## Key Features

- • **Built to Endure:** Waterproof and rugged with a protective case for on-the-go professionals
- • **Smart Calibration:** Auto buffer recognition simplifies setup and boosts reliability
- • **Temperature-Ready:** Automatic temperature compensation ensures flawless readings in any environment
- • **Long-Lasting Power:** Up to 2000 hours of continuous use powered by easy-to-replace AAA batteries
- • **Precision You Can Trust:** ±0.1 pH accuracy for lab-grade results every time

## Overview

The APERA AI209 PH20 is a waterproof, highly accurate pH tester kit featuring ±0.1 pH precision, automatic buffer calibration, and temperature compensation from 32 to 122°F. Designed for durability and convenience, it includes a rugged carrying case, pH 4 & 7 buffers, and offers up to 2000 hours of continuous operation powered by AAA batteries, making it ideal for professionals demanding reliable, on-the-go pH measurements.

## Description

APERA INSTRUMENTS AI209 Value Series PH20 Waterproof pH Tester Kit, ±0.1 pH Accuracy

## 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 |
| Age Range Description | Adult |
| Best Sellers Rank | #2,810 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab pH Meters |
| Brand | Apera Instruments |
| Brand Name | Apera Instruments |
| Color | Regular Kit |
| Customer Reviews | 4.4 out of 5 stars 9,546 Reviews |
| 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 |
| Power Source | Battery Powered |
| Product Care Instructions | Hand Wash Only |
| Reusability | Reusable |
| Special Feature | Waterproof |
| 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)

## 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

### ⭐⭐⭐⭐⭐ Works fast and accurately.
*by D***L on August 20, 2025*

Excellent, thank you. It reads quickly and accurately. Great little container it comes in too. Very fast postage from Amazon. Cheers.

### ⭐⭐⭐⭐⭐ Good quality, well thought out product
*by T***E on July 3, 2025*

More accurate than my test drops at least, seems well built and designed. Case and detailed instructions and laminated sheet with quick instructions/care is great. Batteries don't die quick another plus. Compared to the other reliable PH meters fair priced. Do not go cheap and get the yellow ones unless you are going to double check it with test drops( even then I don't trust them to be .5 ph accurate)

### ⭐⭐⭐⭐⭐ Great option for the price, versatile and reliable
*by A***O on August 11, 2025*

Great option for the price! Very compact and easy to use. I've used it to make skincare at home and so far it has been reliable and easy to clean.The only thing to consider is that the cap is not so well sealed. I filled with a storing solution but it leaked a little.

## 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 Finland*
*Store origin: FI*
*Last updated: 2026-02-23*