Bluelab pH Pen FEATURED They are four times the

They are four times the thickness of regular 10" x 20" trays

Safe & Versatile Design: The Hurricane Pro High Velocity Oscillating Metal Wall Mount Fan can be used alone or in conjunction with an air conditioning unit

Spectrum Tuned: Full Spectrum Growth

Material: Plastic

Bluelab pH Pen FEATURED They are four times theThe Bluelab pH Pen will take measurements in increments of 0. 1 pH and is fully temperature compensated, so you can expect accurate readings every time. Perfect for quick and easy pH and temperature readings direct from your solution. Fully waterproof not just water resistant Simple two point calibration process for accuracy One year peace of mind warranty Automatic temperature compensation for accurate readings everywhere Auto off function to extend