---
product_id: 4206087
title: "Bluelab pH Pen - ± 0.1 pH Accurate - Durable Double Junction Probe"
brand: "bluelab"
price: "£123.92"
currency: GBP
in_stock: true
category: "Bluelab"
url: https://www.desertcart.co.uk/products/4206087-bluelab-ph-pen-0-1-ph-accurate-durable-double-junction
store_origin: GB
region: United Kingdom
---

# Waterproof & floats ±0.1 pH precision Auto temperature compensation Bluelab pH Pen - ± 0.1 pH Accurate - Durable Double Junction Probe

**Brand:** bluelab
**Price:** £123.92
**Availability:** ✅ In Stock

## Summary

> 🌿 Master your environment with pinpoint pH precision — because your growth deserves the best.

## Quick Answers

- **What is this?** Bluelab pH Pen - ± 0.1 pH Accurate - Durable Double Junction Probe by bluelab
- **How much does it cost?** £123.92 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/4206087-bluelab-ph-pen-0-1-ph-accurate-durable-double-junction)

## Best For

- bluelab enthusiasts

## Why This Product

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

## Key Features

- • **Precision that Powers Growth:** Achieve nutrient-perfect pH control with ±0.1 accuracy for thriving crops and crystal-clear water.
- • **Built to Brave Any Environment:** Waterproof, shock-resistant, and buoyant design means your pH pen stays safe and ready—indoors or outdoors.
- • **Designed for the On-the-Go Pro:** Auto-off, low battery alert, temperature units in °C/°F, plus a handy lanyard for seamless, hands-free use.
- • **Smart Calibration, Zero Hassle:** Two-point calibration with included sachets and a 30-day reminder keeps your readings sharp and reliable.
- • **Double-Junction Probe for Longevity:** Minimizes contamination and extends probe life, delivering consistent, trustworthy measurements every time.

## Overview

The Bluelab pH Pen is a professional-grade, waterproof pH meter featuring ±0.1 accuracy and a durable double-junction probe for contamination resistance and extended lifespan. It offers automatic temperature compensation, easy two-point calibration with included solutions, and a floating design for use in water-based media. Ideal for hydroponics, aquariums, pools, and soil testing, this New Zealand-made device combines rugged durability with smart features like auto-off, low battery indicator, and a lanyard for hands-free convenience.

## Description

Bluelab pH Pen - ± 0.1 pH Accurate - Durable Double Junction Probe | Waterproof and Floats - Auto Temperature Compensation - Made in NZ: Meter Ph: desertcart.com: Industrial & Scientific

## Features

- Perfect pH control for various media - ph meter for water hydroponics can be used for growing tents, swimming pools, drinking water, aquariums, fish tanks, and brewing. Our pH meter provides a quick and handy way to manage the success of your crops. Helps you ensure that pH and temperature are always in the optimal range for maximum uptake of nutrients. *Note: readings in tap, reverse osmosis (RO) or distilled water may be slow and/or unstable due to insufficient dissolved Ions (salts).
- Easy calibration - Set up our digital pH meter with a two-point calibration process. Calibrate the handheld meter before first use. Each digital pH meter for soil and water comes with a 30-day calibration indicator that can be viewed on a backlit LCD display. The kit includes one 20-ml sachet of each pH7, pH4, and KCl for initial hydration and calibration.
- Thrives in the toughest environments - Our soil pH tester comes with waterproof casing. It can withstand the knocks, drops, and deep-water plunges. Our digital pool water tester floats when it lands in any solution. Pair our pH tester and PPM meters for complete water and soil nutrient monitoring in indoor gardens.
- Get accurate readings with a double-junction probe. Unlike glass bulbs, the double-junction probe minimizes contamination. Hence, it helps in improving precise readings and has a longer lifespan. This pH pen has automatic temperature compensation for an accurate temperature. Our pH meter for water hydroponics will take measurements in increments of 0.1 pH.
- Top-notch design and manufacturing - This digital pH meter for water and soil is available with an auto-off function. It has a low battery indicator and "C" and "F" units for temperature. Instructions are on the backside of the pH pen. The kit includes an AAA battery and a lanyard for a hands-free option. The pH tester is easily accessible and won't get lost during use or movement.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005POOJHG |
| Best Sellers Rank | #10,034 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #13 in Lab pH Meters #40 in Soil Meters |
| Brand Name | Bluelab |
| Customer Reviews | 4.4 4.4 out of 5 stars (4,779) |
| Global Trade Identification Number | 09421024920234 |
| Item Dimensions | 8 x 2.16 x 0.98 inches |
| Item Weight | 4.32 ounces |
| Manufacturer | Bluelab |
| Material Type | Glass |
| Model | pH Pen |
| Part Number | PENPH |
| UPC | 706842510010 715706332132 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Bluelab
- **Item Weight:** 4.32 ounces
- **Item dimensions L x W x H:** 8 x 2.16 x 0.98 inches
- **Material:** Glass
- **Number of Items:** 1

## Images

![Bluelab pH Pen - ± 0.1 pH Accurate - Durable Double Junction Probe - Image 1](https://m.media-amazon.com/images/I/61wT++wJpbL.jpg)

## Available Options

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

## Questions & Answers

**Q: Why should I choose the Bluelab pH pen over others?**
A: The probe quality. Highly accurate, compensates for temp & is fast to a stable reading. It's a double junction probe, so it's durable. And it's full of thoughtful touches (the ring on top, the storage cap, the calibration indicator to name a few).

**Q: Other pens come with a hard carry case & calibration solutions in plastic bottles. Yours does not. Why is that?**
A: Great question. We have made the deliberate choice to make our packaging as sustainable as possible. To that end, our packaging is all fully recyclable, with no hard plastics or styrofoam inserts.

**Q: How does Bluelab make calibration super easy?**
A: Calibrating is an easy & fast process! Each pen includes calibration solutions & clear instructions. A check mark appears when the pen is calibrated. When the pen loses calibration, the check mark disappears, informing you it's time to recalibrate.

**Q: I sometimes see a white crust built up on the end of the pen. What is this?**
A: This is very common in pH meters & is nothing to worry about. The storage solution used to hydrate your pen (and extend its longevity) is potassium salt, which sometimes dries as a white crust on your probe. Simply rinse this away under water.

**Q: Can I use the pH Pen to measure the pH of tap water, distilled water, or reverse-osmosis water?**
A: No. For distilled & RO water there aren't enough dissolved ions (salts) for a stable pH reading. For tap water, w/o sufficient dissolved minerals, the answer is also no. Adding a few drops of KCL storage solution may work to enable a stable reading.

## Frequently Bought Together

- bluelab pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ
- Bluelab pH 4.0 & 7.0 Calibration Solution Kit - pH Meter & pH Pen Calibration for Balanced Nutrient Solution NIST Traceable | Hydroponics, Gardening & Growing Tents (500 ml/ 16.9 Fl Oz Each)
- Bluelab STSOL120 KCL Storage Solution 120ml pH Probe and Pen, Maintain Meters Used for Water, Soil, and Hydroponic System or Indoor Plant Grow White

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*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-08-07*