---
product_id: 4206087
title: "pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ"
brand: "bluelab"
price: "HK$1218"
currency: HKD
in_stock: true
reviews_count: 13
category: "Bluelab"
url: https://www.desertcart.hk/products/4206087-ph-pen-0-1-ph-accurate-durable-double-junction-probe
store_origin: HK
region: Hong Kong
---

# Waterproof & floats ±0.1 pH precision Auto temperature compensation pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ

**Brand:** bluelab
**Price:** HK$1218
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your pH game — precision and durability that grow with you!

## Quick Answers

- **What is this?** pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ by bluelab
- **How much does it cost?** HK$1218 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/4206087-ph-pen-0-1-ph-accurate-durable-double-junction-probe)

## 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

- • **Built to Brave the Elements:** Waterproof casing and floating design ensure durability and reliability even in the toughest environments.
- • **Precision that Powers Growth:** Achieve ultra-accurate ±0.1 pH readings for optimal nutrient uptake in hydroponics, aquariums, and pools.
- • **Designed for the On-the-Go Pro:** Lightweight, auto-off function, low battery alert, and included lanyard keep you efficient and hands-free.
- • **Smart Calibration, Zero Guesswork:** Easy two-point calibration with clear 30-day reminders keeps your measurements consistently on point.
- • **Double-Junction Probe for Longevity:** Minimizes contamination and extends probe life, delivering stable, precise readings every time.

## Overview

The Bluelab pH Pen is a professional-grade, waterproof pH meter featuring ±0.1 accuracy, a durable double-junction probe, and automatic temperature compensation. Designed for hydroponics, aquariums, pools, and soil testing, it offers easy two-point calibration with a 30-day reminder, floats for safety, and a rugged build made in New Zealand. Perfect for millennial growers and pros seeking reliable, precise pH control to maximize nutrient uptake and crop success.

## Description

bluelab pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ: Meter Ph: desertcart.com: Industrial & Scientific

Review: Measuring pH can be more challenging than expected... - 2/18/25 Update: BlueLab reached out to me to resolve the issues I was having. They ended up sending me a new pH pen and shared some information on a few things worth considering. My new pen arrived and the storage cap was still moist with storage solution (this is a good thing). The new meter does work better than the original one, but I also suspect that my tap water has "low ionic content" which can cause pH readings to drift (this was also mentioned by BlueLab in their communications with me). I have found that the first readings of the day with the BlueLab pH pen can be a bit low when checking tapwater at my house. If I add nutrients to the water, the pH readings are much more definitive and easy to take. I believe this is to do with the ionic content. I experienced similar behavior with some other, cheaper pH meters. The BlueLab pen reads the calibration solutions quickly and accurately. My advice to anyone new to and/or serious about measuring pH, buy yourself some pH drops (General Hydroponics sells an affordable kit) so you can definitively measure your pH using a visual color matching method and compare to your meter readings. I found that the drops worked the same every single time without error or question or waiting and gave me more confidence in working with electronic pH meters. With some experimenting, I was able to figure out how to get repeatable and accurate readings from the BlueLab pH pen; Sometimes getting a reading of my tapwater that I am confident in takes a few tries. Why get a pen if drops work so well? The color shades when using drops are distinguishable between 6.0 and 6.5 for example, but identifying in between can be difficult to judge. The BlueLab pen gives me 0.1 resolution/accuracy that is needed when doing hydroponic gardening. Having both ways to check pH is ideal. I suspect that pH pens are generally not terribly expensive to manufacture, but it is costly to have a support team available to reach out to communicate with and help customers with their products. Ultimately, BlueLab came through with service, something that is rare these days. I appreciate this and have raised my rating to 5 stars. I really like the BlueLab pen cap, with the sponge that keeps storage solution on the bulb, and the rope used to connect it is also helpful when taking pH samples in a bucket. I do however, wish the the base of the cap was a bit wider so the pen could stand up on its own more reliably. I also wish the meter displayed down to 0.01, not because I need more accuracy, but because I want to see what the current measurement trend is doing (going up/down). The auto off timer also feels a bit short, but I suppose that is both good and bad. 1/10/25 (Original Review) I really wanted to like this expensive PH meter. Sadly It came with a dry probe so I soaked it as directed for 24 hours. Calibrated it 3x with Bluelab 4 and 7 solution but readings would drift for several minutes after each calibration. Tap water would measure at 6.4 right after calibration but leaving the pen in the same sample of tap water the reading would drift up to 7.5 after several minutes. It would never read the same value twice. Just a few minutes after calibration it would read the calibration solution several tenths lower than it should. I bought this expecting accuracy, not games. Returning.
Review: Game changer - This meter was a game changer for me, took a lot of stresses away since I live and die by accurate ph readings for growing them trees! High quality piece here that I (beyond) highly recommend this product! Easy to use on every level.. easy calibration with great directions to get you going. Speed and accuracy…love the fact it tells you when you got it calibrated correctly and also when it needs it again! 10 stars ⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️

## 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 |
| Batteries | 1 AAA batteries required. (included) |
| Best Sellers Rank | #13,849 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #12 in Lab pH Meters #34 in Soil Meters |
| Customer Reviews | 4.4 4.4 out of 5 stars (4,929) |
| Is Discontinued By Manufacturer | No |
| Item Weight | 4.3 ounces |
| Item model number | pH Pen |
| Manufacturer | Bluelab Corporation Limited - Import (NZ) |
| Product Dimensions | 8 x 2.16 x 0.98 inches |

## Images

![pH Pen - ± 0.1 pH Accurate, Durable Double Junction Probe, Waterproof & Floats, Auto Temperature Compensation, Easy Calibration - Made in NZ - Image 1](https://m.media-amazon.com/images/I/71NiAJy-ZqL.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Measuring pH can be more challenging than expected...
*by R***N on January 11, 2025*

2/18/25 Update: BlueLab reached out to me to resolve the issues I was having. They ended up sending me a new pH pen and shared some information on a few things worth considering. My new pen arrived and the storage cap was still moist with storage solution (this is a good thing). The new meter does work better than the original one, but I also suspect that my tap water has "low ionic content" which can cause pH readings to drift (this was also mentioned by BlueLab in their communications with me). I have found that the first readings of the day with the BlueLab pH pen can be a bit low when checking tapwater at my house. If I add nutrients to the water, the pH readings are much more definitive and easy to take. I believe this is to do with the ionic content. I experienced similar behavior with some other, cheaper pH meters. The BlueLab pen reads the calibration solutions quickly and accurately. My advice to anyone new to and/or serious about measuring pH, buy yourself some pH drops (General Hydroponics sells an affordable kit) so you can definitively measure your pH using a visual color matching method and compare to your meter readings. I found that the drops worked the same every single time without error or question or waiting and gave me more confidence in working with electronic pH meters. With some experimenting, I was able to figure out how to get repeatable and accurate readings from the BlueLab pH pen; Sometimes getting a reading of my tapwater that I am confident in takes a few tries. Why get a pen if drops work so well? The color shades when using drops are distinguishable between 6.0 and 6.5 for example, but identifying in between can be difficult to judge. The BlueLab pen gives me 0.1 resolution/accuracy that is needed when doing hydroponic gardening. Having both ways to check pH is ideal. I suspect that pH pens are generally not terribly expensive to manufacture, but it is costly to have a support team available to reach out to communicate with and help customers with their products. Ultimately, BlueLab came through with service, something that is rare these days. I appreciate this and have raised my rating to 5 stars. I really like the BlueLab pen cap, with the sponge that keeps storage solution on the bulb, and the rope used to connect it is also helpful when taking pH samples in a bucket. I do however, wish the the base of the cap was a bit wider so the pen could stand up on its own more reliably. I also wish the meter displayed down to 0.01, not because I need more accuracy, but because I want to see what the current measurement trend is doing (going up/down). The auto off timer also feels a bit short, but I suppose that is both good and bad. 1/10/25 (Original Review) I really wanted to like this expensive PH meter. Sadly It came with a dry probe so I soaked it as directed for 24 hours. Calibrated it 3x with Bluelab 4 and 7 solution but readings would drift for several minutes after each calibration. Tap water would measure at 6.4 right after calibration but leaving the pen in the same sample of tap water the reading would drift up to 7.5 after several minutes. It would never read the same value twice. Just a few minutes after calibration it would read the calibration solution several tenths lower than it should. I bought this expecting accuracy, not games. Returning.

### ⭐⭐⭐⭐⭐ Game changer
*by B***3 on January 7, 2026*

This meter was a game changer for me, took a lot of stresses away since I live and die by accurate ph readings for growing them trees! High quality piece here that I (beyond) highly recommend this product! Easy to use on every level.. easy calibration with great directions to get you going. Speed and accuracy…love the fact it tells you when you got it calibrated correctly and also when it needs it again! 10 stars ⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️

### ⭐⭐⭐⭐⭐ Quality PH Meter.
*by W***E on February 1, 2026*

This pen is a little pricey but remember you get what you pay for. It works great and it’s easy to calibrate, If you need a quality ph meter this is the one,

## 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 Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-01*