Mammoth Lighting PAR Meter and Spectrometer Add Wand?:Yes | $Free (Worth $30) If you need to interface

If you need to interface your lights with your environmental control system

Protect your eyes under full-spectrum LED with FX2 lenses

Three types of precise digital PSI readouts: hydraulic fluid PSI

Three prong plug

Mammoth Lighting PAR Meter and Spectrometer Add Wand?:Yes | $Free (Worth $30) If you need to interfaceFull spectrum analysis from 380 to 780nm with 2nm resolution, touchscreen interface, and 24 hour battery life at a fraction of lab grade cost. The Mammoth Lighting M400 PAR Meter & Spectrometer is built for growers, researchers, and lighting professionals who demand accurate, real world data. Featuring a high speed CPU and precision CCD sensor with a long focal cross asymmetric CT spectroscopy system, it delivers 2nm optical resolution and full