Excellent 
Bluelab CF Pen
Don't overfeed or underfeed plants! Monitor your nutrient strength & temperature with a Bluelab CF pen.
It doesn't cost much, but it's just what you need.
You can hold readings and choose your units. To make life easy, calibration is optional.
Since temperate affects CF, your CF pen has automatic temperature compensation. That way, you get an accurate reading every time.
It also takes your nutrient temperature, so you can keep it inside the ideal range (18 - 21oC).
Use it every time you change or top up your feed.
€¢ Measures CF/EC and nutrient temperature
€¢ Automatic temperature compensation
€¢ Choose your units: °C, °F, EC, CF, ppm 500 and ppm 700
€¢ Backlit LCD display
€¢ Optional calibration
€¢ Successful calibration indicator
€¢ Hold reading function
€¢ Low battery warning
€¢ Fully waterproof
€¢ Auto off function (after 4 minutes)
€¢ Smart loop handle
€¢ 1 year warranty included
We recommnd teaming this CF pen with a Bluelab pH Pen to cover all bases.
Questions & Answers
Have a Question?
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Do the cf and ph pens come ready calibrated.
The Bluelab cF pen does not need to be calibrated, we would recommend calibrating the pH pen regularly.
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Does the pen give readings in cF only or is there also an EC reading?
The Bluelab cF pen will give both cF & EC readings.