Bluelab Truncheon Nutrient Meter, Digital Conductivity Tester in Water (EC, 500, ppm 700, CF, TDS) Tool for Hydroponic System and Indoor Plant Grow
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Extended holiday returns
Returnable until Jan 31, 2026 Learn more
Returnable until Jan 31, 2026 Learn more
This item's return window has been extended for the holiday season: Returnable until Jan 31, 2026
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
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Availability:
In Stock.
Arrives
Friday, Nov 7
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Style: Truncheon (Tighter Measurement Increments)
Features
- Quickly monitor for precise up and down adjustment of your nutrient (TDS) level in solution to maximize your grow and ensure plants get the balanced feed they need; Measures while mixing nutrients in your tank
- Measurement Range: 2 to 36 CF, 0.2 to 3.6 EC, 140 to 2520 ppm (EC x 700), 100 to 1800 ppm (EC x 500); General uses include gardening, hydroponics growing tent and reservoir
- Comes factory calibrated (no calibration required) and is fully waterproof; Automatic Temperature Compensation provides consistent reading regardless of any fluctuations in temperature
- Combine with pH tester and other meters for full garden nutrients monitoring in water; Other features: Auto off function, no buttons or switches; KIT INCLUDES: AA batteries, Truncheon case, probe care kit sold separately
- Made in New Zealand and manufactured by Bluelab, the industry leader in hydroponic testing equipment, built for growers; 5-Year Limited Warranty with proof of purchase
Product Dimensions: 15.94 x 1.18 x 1.18 inches
Item Weight: 7 ounces
Manufacturer: Bluelab Corporation Limited - Import (NZ)
Item model number: TRUNV2
Batteries: 3 AA batteries required.
Is Discontinued By Manufacturer: No
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Friday, Nov 7
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Style: Truncheon (Tighter Measurement Increments)
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!
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Reviewed in the United States on October 23, 2015 by P
Style: Truncheon (Wider Measurement Range)
Its nice out of the box. I got accurate reading from this right away comparing it to two separate meters. I always wanted one and I'm glad I got it now. I still don't know if this is something you would only wanna use with large volumes or if its the perfect grow accessory for everybody. Its already better than a pen just for the fact that you can ditch one for button battery device as this uses a battery's but I can't remember if its triple or double.
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Reviewed in the United States on August 16, 2025 by Adam G
Style: Truncheon (Wider Measurement Range)
This product is a joy to use! Upgrading from a cheap Chinese-made digital meter, the experience is night and day different. The readings are quick, CONSISTENT, and super easy to read. I love that this doubles as a nutrient stir stick, and the no button/no switch design makes it effortless to use. Here's the difference between this product (commercial) and the standard truncheon: the commercial has a wider measurement range, from 0.4 EC to 6.0 EC. That's it. The standard truncheon goes from 0.2 EC to 3.6 EC. The standard model is fine for any hobbyist, but you may want the commercial if you are going to mix up nutrient liquid concentrates, and then add them to your nutrient reservoir through an automated measuring and dosing system. I purchased the commercial model because it was on sale for the same price as the standard model, and I thought "commercial" must equal "better." I probably don't need the increased range, but I have no regrets: it works perfectly fine for my purposes, and I can upgrade later to an automated dosing system if I choose. Whichever model you get, the Truncheon is absolutely worth the price of entry. It's so easy and intuitive, and cleanup is just a spritz of tap water or a dab with a towel. Nutrient testing is now my favorite part of the routine.
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Reviewed in the United States on November 8, 2022 by Dave B.
Style: Truncheon (Tighter Measurement Increments)
Works as expected
Reviewed in the United States on August 13, 2025 by J.M.B.
Style: Truncheon (Tighter Measurement Increments)
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.
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Reviewed in the United States on March 5, 2022 by Robert from Alaska
Style: Truncheon (Tighter Measurement Increments)
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
Reviewed in the United States on August 3, 2025 by Raymond
Style: Truncheon (Tighter Measurement Increments)
Le ha pasado que cuando cambia la batería se vuelve loco y da diferentes medidas ?? Como se calibra o que hay que hacer.? Se me han muerto mis plantas
Reviewed in the United States on June 29, 2025 by Kinaysha Borges
Style: Truncheon (Tighter Measurement Increments)
Works great easy to use, wait for a sale.
Reviewed in the United States on January 19, 2025 by J. Hill