The apogee par/pur meters are good and easy to use fwiw.Conclusion = The Seneye device is maybe the most ridiculous piece of equipment i ever bought. Cons: can't use my mac to set it up, can't get the par readings in real time, and the device floats so you have to some how hold it down in order to get a reading of a deep area. So I now have the device used for 5 minutes and an unopened box of 3 new discs for it. I gotta find someone to sell it to or give it to or something. Two days two failures! I am sure tomorrow i am going to beat up some iron and throw it around the gym haha... the iron has no brain, no evasive tactics, no power needs and no computer software...i got this one for sure!! Victory will be mine!!