TRUNV2

Bluelab Truncheon Nutrient Meter

The original and industry-standard nutrient meter, trusted by growers worldwide for accurate and reliable readings.

Ensure your plants get optimal nutrients with the Bluelab Truncheon Nutrient Meter. Simply dip it in, and flashing lights provide precise readings adjusted for temperature, displaying CF, EC, PPM 500, and PPM 700 effortlessly. Built tough and waterproof, these meters require no calibration, making them ideal for hassle-free use while stirring your nutrient solution.

Features:

  • Robust, reliable, and waterproof construction for longlasting value
  • Automatically detects liquids, and bright LEDs indicate reading for brilliantly simple functionality
  • Long-format design for mixing and measuring nutrient reservoirs simultaneously
  • No calibration required, and easy to clean and disinfect
  • Measure conductivity in EC, CF, PPM 500 (TDS) or PPM 700

Also available in: Bluelab Commercial Truncheon Nutrient Meter (0–6 EC)

  • Product manual
  • Technical specifications

Need a wider EC range?

Bluelab Commercial Truncheon Nutrient Meter

Bluelab Truncheon – The Ultimate Nutrient Meter!

Measure your solution’s EC and PPM with confidence. Watch now to see how the Truncheon sets the standard for accuracy and durability!

Watch Video

Optimise nutrient levels in your reservoir

All plants need access to the correct amount of food (nutrients) so that they can grow and flourish. Over- or under-feeding your plants can result in the waste of expensive nutrient resources and plant health issues.

The simplest way to keep track of the amount of nutrients in your solution is to measure conductivity, which refers to the total ionic content (dissolved salts) in a solution. From a scientific perspective, when nutrients are added, this creates the potential for electricity to move through a solution, increasing the electrical conductivity.

By measuring and adjusting nutrient levels, you’ll ensure that your plants are getting the macro- and micro-nutrients they need for superior plant health.

Choose the right fit for your system: Bluelab Truncheon Nutrient Meter (0.2–3.6 EC) or Bluelab Commercial Truncheon Nutrient Meter (0–6 EC).

The grower’s nutrient meter of choice

Robust design that’s built to last

Tried, tested and loved by growers for decades, the Bluelab Truncheon Nutrient Meter is renowned as the best conductivity meter for measuring solution. This brilliantly simple, bullet-proof nutrient meter allows you to measure and adjust nutrient levels for optimal plant performance.

The Bluelab Truncheon Nutrient Meter may have been designed for everyday use, but it’ll become your growing companion for life.

Find the right product for your needs

Compare to other Bluelab products

Product name
Price
Growing method
Parameter
Type
Recommended for
Warranty
Connected
Replaceable pH Probe
Current product
Bluelab Truncheon Nutrient Meter
Solution
Conductivity (EC)
Handheld
Home Growers
5 years
No
No
Comparison product
Bluelab Conductivity Pen
Solution
Conductivity (EC) Temperature
Handheld
Home Growers
1 year
No
No
Comparison product
Bluelab Commercial Truncheon Nutrient Meter
Solution
Conductivity (EC)
Handheld
Commercial Growers
5 years
No
No
  • Works awesome, so easy to use and super accurate
  • Best meter I've purchased so far due to not needing calibration and working as advertised
  • Super easy to use, instantly readable, durable, and accurate
K
Kevin H.
Perfect, wonderful, excellent

I bought a cheap brand from from Amazon and I was sorry. It took me a few days to realize what was going on, and by then, some of my plants were dead. The readings started being erratic, but unlike the airplane pilots that crash because they don't trust their instruments, I decided to trust my instruments, and that killed some of my plants. Then I bought this one from Bluelab. Problem solved. You get what you pay for and I know that, and I should have done this in the first place. It turns on when you put it in liquid and it turns off a few seconds after you take it out, to give you time to look at it even more if you want to before it turns off. It comes pre-calibrated and has a 5-year warranty. It's waterproof. It got here in about 8 hours with free shipping, and it came on Father's Day. Not that I want to but I can't figure out how anybody would rate this less than five stars.

B
Brian
Works Great

Works awesome, so easy to use and super accurate

V
V.R.
Arrived calibrated and accurate and is stilll accurate 8 months later

We use it for measuring EC in the hydroponic nutrient solution on our market farm where we grow lettuce. It has been the best meter I've purchased so far due to not needing calibration and working as advertised right out of the box. Would buy again.

R
Raymond
High quality

Love this for mixing my nector solution and knowing my ec. Seems to be accurate every month when i check the calibration. Blue labs high quality

R
Robert f.A.
You wont regret buying the Truncheon

After buying and returning a cheaper item, I am back to an awesome brand and an item I had used for years and that I trust to help me keep my Hydroponic systems in the correct range. This truncheon is super easy to use, instantly readable, durable, and accurate. The cheap alternative was not waterproof, didn’t read consistently, and failed completely in less than a week. The last truncheon I owned lasted 3 years of daily commercial use monitoring 6 high volume flow systems. Trust BlueLab, worth the extra money.

J
John B.
Makes a good product

Bluelabs make the best devices for ph, ec and temp in the Hydroponic community ! They last a long time and they have grate customer services it you have a problem, you can all them and they will help you get your problem fixed. I bought this EC tool so that I could muser the amount of nutrient that I had in my nutrient tank to make sure that the levers are the right amount. I grow many different kind of vegetable and I use different kind and mik different types of NPK for all they different system that i have so I use this tool to make sure that each nutrient tank has the right amount of nutrient in it. I love this tool . It is worth paying for the real name brand tool !

T
Tim
Super Reliable

This is the second Bluelab truncheon we've had. These are utterly reliable and hold up in the harshest conditions. After years of abuse, the first one is still going strong. It's accurate when tested against calibration solution and hasn't failed us yet. I needed a second one on hand...I'm confident this new one will be just as bulletproof as the first one.

P
P
Very sturdy. Well worth the price!

The meter feels solid and well constructed. The plastic is thick and study (no creaking or flimsiness). The battery compartment has a proper O-ring and the rest of the unit looks to be sealed with glue/silicone. Nice Japanese OEM batteries are included so it's ready to go out of the box.

It's a bit larger than other meters, but that makes it easier to handle. The lanyard very convenient when taking direct measurements inside larger reservoirs such as 50 gallon drums. Even if you do drop this meter into your reservoir it'll be fine because it's fully waterproof.

This meter does not provide exact numeric measurements on a display like some others, but the LED indicators are easy to read and intuitive. If one indicator blinks, then your nutrient concentration is at that level. If two LEDs alternate blinking then the measurement is about halfway between those values. The precision should be enough for any hydroponics system.

The meter turns on automatically when it detects water above the minimum PPM and turns off automatically after displaying the reading for a while. There are no controls on the meter. It doesn't turn on when immersed in common tap water, so accidental battery drain isn't a problem. The detector element itself is also very sturdy and easy to clean. I usually rinse it off every few measurements and store it in the protective case.

Buy it!