BLUELAB - CONDUCTIVITY PEN (EC OR PPM)

Marsoni

M251S

$93.60

Get it in 3 business days with 1 day shipping. Friday, May 29

BLUELAB - CONDUCTIVITY PEN (EC OR PPM)Bluelab Conductivity Pen: The Essential Solution for Monitoring Conductivity and Temperature! The Bluelab conductivity pen provides you with a simple and quick way to check whether your plants have the right amount of nutrients in the solution, allowing you to make any necessary adjustments. Proper plant feeding requires knowing exactly what you are giving them. Start with high quality nutrients. Measuring conductivity every day is essential to avoid

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I used this to turn on with key on power in my truck. Power then goes through this and turns on my key on fuse panel. That way I can run a much larger cable from the battery to the fuse panel instead of pulling power through the ignition switch, where power output is limited. So far it doesn't get hot, though I am not running anything close to 500 amps through it. More like 75 amps max and even then it's only sometimes. No problems so far.

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Reviewed in the United States on July 28, 2024

Verified Purchase

Astrid Falcon

Houston, US

★★★★★ 5

Heavy duty and has lasted three years so far

I have had this relay installed in the engine bay of my Lexus RX 300, functioning to link the front battery to the additional battery in the trunk whenever the ignition is on. The relay has worked reliably for about three years now with no complaints besides one minor comment, be careful when threading down the nut on the Low voltage side. It is prone to stripping

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Reviewed in the United States on March 24, 2025

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Dr.Ortiz Ayala

Charlottesville, US

★★★★★ 5

It delivers as advertised.

Works as advertised, and is easy to install.

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Reviewed in the United States on August 18, 2025

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JOHN A.

Whiting, US

★★★★★ 5

Heavy Duty!!

Performed extremely well. No buzzzing or poor connection. Extremely well built and has been working issue free for over 6 months! Instalation can be a bit difficult due to size and weight. Not really a problem.

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Reviewed in the United States on November 25, 2024

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shawn

Cuba, US

★★★★★ 4

Seems to be ok for the money

We use it to power a 2000w inverter for the refrigerator and microwave on our boat where sometimes it will stay on continuously throughout the day and it hasn't let us down. As others have said, the terminals are awful close together but for the money, it's worth it.

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Reviewed in the United States on January 21, 2025