Bluelab Soil pH Pen

All plants need a balanced diet of nutrients (food) in order to grow. However, plants can only access nutrients if the pH (potential Hydrogen) of your growing medium falls within the correct range.

Contrary to popular belief, all growers need to measure pH, regardless of whether you’re growing in soil or in solution. That’s because pH plays an important role in making your nutrients soluble so that they can be absorbed by plants. If your medium is too alkaline or too acidic, your plants won’t be able to get all the nutrients they need. Temperature is also important, as it can impact your plants’ structure and growth rate.

Bluelab Soil pH Pen Key Features

• Effective in most growing media and in water/solution
• Fully waterproof - not just water resistant
• Industry-leading one-year warranty for peace of mind
• Hold reading function to capture measurements with ease
• Simple two-point calibration for increased accuracy
• Auto-off function to extend battery life
• Automatic temperature compensation for accurate readings everywhere
• 1 x AAA alkaline battery included; simply power on and go

Bluelab Soil pH Pen How to Use

1. Prepare Soil

With the storage cap/dibber on the pen, press the Soil pH Pen into the sample area until it reaches the word "Soil" at the top of the dibber. Remove gently from the soil or substrate, leaving a small hole. 
Note: Unscrew the cap/dibber first, then gently pull the probe from the dibber. There will be KCl solution in the probe holder, so be careful.

2. Measure the pH of your soil or substrate

Remove the storage cap/dibber from the pen gently. Turn the Soil pH Pen on, by pressing the Power button. (The last measurement is recalled for 3 seconds. To turn the pen off, press and hold the Power button until OFF is displayed.) Place pH probe into the hole in the soil or substrate. Do not exert sideways pressure. Wait for the reading to reach a consistent value.
Note: Never make a hole in the soil or substrate with the pH probe. Always use the storage cap/dibber.

3. To hold reading

To hold the measurement on the LCD screen, short press the power button. To exit the hold function, short press the power button again. 

4. To change temperature units

To toggle between °C and °F, press and hold the Units button, then short press it to switch modes when the display starts to flash. To exit, don't press anything for 3 seconds.

5. Rinse and place on the storage cap and dibber

To ensure accurate pH measurements, always rinse the probe after use in clean fresh tap water. Then, replace the storage cap/dibber. 
For field testing, repeat the procedure in different locations and take the average of the measured data to represent the pH of the sample area.

Bluelab Soil pH Pen Manual

Click to see full manual