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General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians...
$32.99
General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH, EC and TDS meters (NaCl scale or the 442 scale). General Hydroponics technicians check each batch to ensure that our solutions are precisely calibrated and yield reliable readings each time they are used.
Bestseller Products
Kind K5 Series LED Grow Lights (XL750-XL1000)
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Kind K5 Series LED Grow Lights (XL750-XL1000)
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Unit Farm: UFO Cree Series LED Grow Lights (80-320)
The Unit Farm UFO LED grow lights incorporate high-output Cree™ and Osram™ LEDs for ultimate reliability, intensity, and efficiency. The Unit Farm series features Veg and Flower modes to help you save energy during...
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Mars II Series LED Grow Lights (400-1600)
Mars II 400 LED grow light Coverage: 2.5'x2.5' (76cmx76cm) Max Yield: 1.8g/watt PPFD: 752 Replace HID/MH: 250W Draw Power:110V/170W±5% / 220V/165W±5% Mars II 700 LED grow light Coverage: 3'x3' (92cm x 92 cm) Max Yield: 1.8g/watt...
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Mars Hydro Pro II EPISTAR Series (80-320)
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Kind K3 Series LED Grow Lights (300W-600W)
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Mars Reflector Series LED Grow Lights (48-192)
The Mars Reflector Series offers powerful LED-based units featuring custom spectrum diffusers to maximize energy efficiency and coverage area. The compact design, cool operating temperatures and extra-large coverage area makes...
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Unit Farm UFO LITE LED 200-600
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Spectrum King 600W LED Industrial Grow Light (120°)
650 Watt Full Spectrum LED Grow Light made in the USA. Replaces 1000W-1200W Dual-Ended Bulbs (both MH HPS). Can be used for both vegetative and flower growth. Currently the world’s...
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ZELION HL300 LED Grow White
The ZELION HL300 Grow White is a 100 to 600 watt fully dimmable and spectra tunable LED light fixture designed for horticulture applications in collaboration with growers needing special lighting...
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Lightspeed Flip 16 Lighting Controller
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