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Bluelab PENCON Conductivity Pen and Digital TDS Meter, Water Tester for Temperature and Nutrient (CF, EC, PPM 500, PPM 700), TDS Testing Kit for Hydroponic System and Indoor Plant Grow

4.6 4.6 out of 5 stars 1,039 ratings

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Bluelab Conductivity Pen

Purchase options and add-ons

  • Conductivity pen can test and monitor your nutrients (TDS) level to maximize your grow and ensure plants get the balanced feed they need; General uses include growing tent, swimming pool, drinking water, aquarium, fish tank, and brewing
  • This hydroponics tester has ATC that provides consistent reading regardless of any fluctuations in temperature; Durable design for repeated uses and fully waterproof and it floats in any solution
  • Calibration optional, the meter comes factory calibrated so it's ready to be used; Regular cleaning is recommended for accurate reading; Different units are available (EC, PPM 500, PPM700, and CF)
  • Combine with our pH pens and meters for full garden nutrient monitoring in water and soil; Other features: Auto off function, low battery indicator, units for temperature; KIT INCLUDES: AAA battery, probe care kit is sold separately
  • Made in New Zealand and manufactured by Bluelab, the industry leader in hydroponic testing equipment, built for grower; 2-Year Limited Warranty with proof of purchase

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Language ‏ : ‎ English
  • Product Dimensions ‏ : ‎ 9.8 x 2.2 x 1.3 inches; 3.84 ounces
  • Item model number ‏ : ‎ PENCON
  • Batteries ‏ : ‎ 1 AAA batteries required. (included)
  • Date First Available ‏ : ‎ August 14, 2011
  • Manufacturer ‏ : ‎ Bluelab Corporation Limited - Import (NZ)
  • ASIN ‏ : ‎ B005IGXOK4
  • Customer Reviews:
    4.6 4.6 out of 5 stars 1,039 ratings

Product Description

The ultimate solution for measuring conductivity!The Bluelab Conductivity Pen is the latest innovation for hand held conductivity meters. It provides a compact, quick and handy way to manage the success of your crops.The Bluelab Conductivity Pen simply tells you that your plants have the right amount of nutrient in your solution and lets you know if adjustments are needed. Display options available in °C, °F, EC, CF, ppm 500 and ppm 700.


From the brand


From the manufacturer

Bluelab Conductivity Pen promotes healthy growing with precision

Bluelab PENCON Conductivity Pen

A compact and robust handheld solution

Key features include:
  • Fully waterproof - not just water resistant
  • Selectable measurement units so you can customize with your preferences
  • Automatic temperature compensation for accurate readings everywhere
  • Flat electrode for easier cleaning and maintenance
Everyday accuracy of the fundamentals

Providing quick and accurate readings at the click of a button. For conductivity readings, you can choose between EC, CF, PPM 500 (TDS) or PPM 700; for temperature, you can select ˚C or ˚F.

Get the fundamentals of growing right, every time

Healthy plants need a balanced diet

All plants need access to the right amount of food (nutrients) so that they can grow and thrive. Over- or under-feeding your plants can result in the waste of expensive nutrient resources. The easiest way to keep track of the amount of nutrients in your solution is to regularly measure conductivity, which refers to the total ionic content (dissolved salts) in a solution.

New Zealand-made quality, built for growers

Our products are designed and built with growers, for growers - so you can relax knowing that your pen can withstand the knocks, drops and deep-water plunges that come with everyday growing. The Bluelab Conductivity Pen has been designed and built in New Zealand.

Tried and trusted by growers like you

Bluelab PENCON Conductivity Pen Calibration

Bluelab PECON Conductivity Pen Easy to Use

Bluelab PENPH pH Pen Grower

Bluelab tick

Factory calibrated

The Bluelab Conductivity Pen comes factory calibrated. Calibration is optional. Each pen comes with a 30-day calibration indicator that can be easily viewed on a backlit LCD display.

Flat electrode is easy to use

The pen has a flat electrode for easier cleaning and maintenance. Regular cleaning will improve accuracy and increase the lifespan of the probe.

Superior design and manufacturing

All Bluelab products are proudly designed and manufactured in New Zealand. The design focuses on ergonomic qualities to assist with regular use in varying grow environments. Our rigorous production process includes each pen being inspected by hand before it finds its way to you!

The Bluelab promise

All Bluelab's handheld pens come with superb support. This means that you can have complete peace of mind when you invest in the Bluelab Conductivity Pen.

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Grower's Toolbox pH Pen Combo Meter Guardian Monitor Soil pH Pen Pro Controller
Customer Reviews
4.4 out of 5 stars
1,139
4.4 out of 5 stars
4,484
4.4 out of 5 stars
944
4.4 out of 5 stars
733
4.2 out of 5 stars
953
Accuracy Bluelab pH Pen: 0.1 pH, 1°C/2°F; Bluelab Conductivity Pen: 0.1 EC, 1 CF, 50 PPM (PPM 500 TDS), 70 PPM (PPM 700), 1°C/2°F 0.1 pH, 1°C/2°F 0.1 pH, 0.1 EC, 1 CF, 50 PPM (PPM 500 TDS), 70 PPM (PPM 700), 1°C/2°F 0.1 pH, 0.1 EC, 1 CF, 50 PPM (PPM 500 TDS), 70 PPM (PPM 700), 1°C/2°F 0.1 pH, 1°C/2°F 0.1 pH, 0.1 EC, 1 CF, 50 PPM (PPM 500 TDS), 70 PPM (PPM 700), 1°C/2°F
Parameters measured pH, conductivity/EC, temperature pH, temperature pH, conductivity/EC, temperature pH, conductivity/EC, temperature pH, temperature pH, conductivity/EC, temperature
Replaceable probe
Backlit screen
Power supply 1 x AAA alkaline battery per pen 1 x AAA alkaline battery 2 x AAA alkaline batteries Input: 100-240 Vac, 50-60 Hz, 5 VA, 4 interchangeable plug types (USA, Euro, UK, NZ/AUS) Output: 5VDC 1Amp 1 x AAA alkaline battery Input: 100-240 Vac, 50-60 Hz, 5 VA, 4 interchangeable plug types (USA, Euro, UK, NZ/AUS) Output: 24VDC 0.4amp
Popular for Hydroponic nutrient solution measuring starter kit Hydroponic nutrient availability measuring in solution Powerful handheld nutrient solution measuring with probes capable of sitting in reservoir Wall-mounted nutrient solution monitoring for medium to large reservoirs with alarm parameters Hydroponic nutrient availability measuring in media Wall-mounted nutrient solution monitoring for medium to large reservoirs with alarm parameters and automated dosing (pumps sold separately
Bluelab Grower in Greenhouse

Bluelab: Trusted by growers like you for over 30 years

For over 30 years, Bluelab has been providing award-winning and innovative technology that helps growers unlock their plants' full potential. At Bluelab, we believe that our commitment to designing hardy, purpose-built products and creating strong educational programs will help elevate the standard of growing. Together with our growers, we will create a world with fewer pesticides, food miles and less water usage. Let Bluelab’s products take your growing to the next level.

Product guides and documents

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Customer reviews

4.6 out of 5 stars
4.6 out of 5
1,039 global ratings

Customers say

Customers like the quality, ease of use, accuracy, and value of the lab supply. For example, they mention it works well, is easy to care for, and takes great data. That said, opinions are mixed on durability, and readability.

AI-generated from the text of customer reviews

44 customers mention32 positive12 negative

Customers like the quality of the lab supply. They mention that it works well, is easy to use, and is helpful in the use of the instrument. Some say that the product worked well for 2 years, then stopped working.

"...The BlueLab EC/TDS meter works without fail every time and it has a replaceable battery!!" Read more

"...Instructions came with it and was very helpful in the use of the instrument. I thought it was a reasonable price for the product...." Read more

"...4 stars is because the pen shouldn't get filled with water and become unusable being that the company says there fully waterproof and especially for..." Read more

"Great product, worth the extra money" Read more

24 customers mention24 positive0 negative

Customers find the TDS EC meter easy to use and read. They appreciate the clear instructions that come with the product. Additionally, customers say it's a great beginner tool and easy to calibrate.

"...Instructions came with it and was very helpful in the use of the instrument. I thought it was a reasonable price for the product...." Read more

"The only brand of ph and ec meters I will ever use.Accurate ,easy to read and calibrate!" Read more

"...This EC meter is easy to use & Read.It feels like it is well built...." Read more

"The pen is easy to use and can read in 500ppm and 700ppm conversions as well as EC but you need to use the 500ppm mode since EC mode only reads to 1..." Read more

23 customers mention19 positive4 negative

Customers like the accuracy of the meter. They mention it's incredibly accurate, easy to calibrate, and takes great data. Some say that the pens are not completely waterproof.

"Highly recommend this accurate and built to last EC/TDS meter...." Read more

"I am just getting started with hydroponic and this instrument is very accurate and easy to read...." Read more

"The only brand of ph and ec meters I will ever use.Accurate ,easy to read and calibrate!" Read more

"...Reasonably priced and very accurate. Tested with a couple of different test solutions with consistent results...." Read more

17 customers mention14 positive3 negative

Customers like the value of the lab supply. They say it's a great product for the money, has good quality, and is a must have item for every grower.

"...I thought it was a reasonable price for the product. I would definitely order this instrument from the BlueLab company again!!!" Read more

"Great product, worth the extra money" Read more

"Great products that ar reasonably priced!every Blue lab product I have bought performs excellent.This EC meter is easy to use & Read...." Read more

"...Reasonably priced and very accurate. Tested with a couple of different test solutions with consistent results...." Read more

29 customers mention18 positive11 negative

Customers are mixed about the durability of the product. Some mention it's a nice solid device, very high quality, reliable, and long-lasting. However, others say that it broke right after a month, was expensive, and not durable.

"Highly recommend this accurate and built to last EC/TDS meter...." Read more

"...Had it 5 months. This is my primary pen and now it’s broken. Not sure how to or if I can get a replacement. Highly recommend it." Read more

"...This EC meter is easy to use & Read.It feels like it is well built...." Read more

"This company is great and has long lasting and accurate products. I use all their devices as I deal with a cash crop...." Read more

9 customers mention4 positive5 negative

Customers are mixed about the readability of the EC meter. Some mention it's very accurate and easy to read, while others say that the readings are very inconsonant, inaccurate, and hard to understand.

"...It reads zero up until I put it up to 60 ppm before it finally reads 10 ppm. On top of that, it rounds everything off to the 10’s...." Read more

"...started with hydroponic and this instrument is very accurate and easy to read...." Read more

"...Has also caught it giving 2 different readings back to back. Still using the device but I foresee myself having to replace this sooner than later...." Read more

"...This EC meter is easy to use & Read.It feels like it is well built...." Read more

11 customers mention0 positive11 negative

Customers are dissatisfied with the calibration of the lab supply. They mention that it didn't come factory calibrated, it prevents calibration, and it bricks the meter. They also say that it doesn't stay calibrated and that all of their measurements are off by 50.

"wish it came with more calibration solution." Read more

"Didn’t come factory calibrated and didn’t come with solution to calibrate it.luckily I had some anyway.for those of you that are new it’ll have a..." Read more

"Update: Meter worked well for 2 years, then can not calibrate. Has Temp error which prevents calibration and bricks the meter...." Read more

"...There is no way to calibrate this device so all of my measurement are off by 50 and I have to add 50 to every reading you would never know this is..." Read more

5 month/Need replacement
4 Stars
5 month/Need replacement
It was an amazing accurate pen but not entirely waterproof, or at least mine wasn’t. I didn’t get a picture of the small amount of water that got in from battery cap seal because I dried it quickly without thought so I can’t exactly prove water damage except by my word. Had it 5 months. This is my primary pen and now it’s broken. Not sure how to or if I can get a replacement. Highly recommend it.
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Reviewed in the United States on January 2, 2022
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Reviewed in the United States on July 15, 2023
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Philipp Dietrich
5.0 out of 5 stars Großartiges Produkt einer ökologisch denkenden Firma
Reviewed in Germany on March 7, 2024
Style: Bluelab Conductivity PenVerified Purchase
Sunrise Sublimations
5.0 out of 5 stars The best and held ppm measurement tool on the market
Reviewed in Canada on May 23, 2021
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One person found this helpful
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Steven
5.0 out of 5 stars Blue lab EC pen
Reviewed in the United Kingdom on November 24, 2022
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Saulius
5.0 out of 5 stars perfecto
Reviewed in Spain on September 2, 2022
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Vandelet
5.0 out of 5 stars Du lourd
Reviewed in France on February 14, 2021
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