Bluelab Combo Meter Dollies full spectrum light output 50% higher full spectrum light output 50% higher PPFD compared to HID lamps Broad and even coverage 50% lower power consumption compared to HID lamps 8 passively cooled bars provide broad coverage for full cycle growth Dimmable LED Grow Light with Daisy Chain 3 year Manufacturer's Warranty IP65 waterproof DB: 0dB Lumen: 121373 Do not attempt to to connect directly to the suction side of the raw water pump Other Features include: Replaceable double junction pH probe Over range and under range indicators Auto off function Low battery indicator 2 x AAA alkaline batteries included °F) Calibration of the pH is simple with the push buttons on the meter and fresh calibration solutions