In order to utilize the ammonia and pH monitoring features, Seneye Reef requires controller slides. ... Of course, you don't have to use the slides if you aren't concerned with the pH and ammonia monitoring. However, I find its low monthly cost is absolutely worth the peace-of-mind they provide.

Is the Seneye any good?

The Seneye Reef is a great light meter. That you can get a full featured meter for PAR and color spectrum information for around $200 USD, about half what the comparable Apogee product costs is what makes this product amazing.

How good is the Seneye par meter?

This is a great option for 95% of people needing to measure PAR parameters. The temperature has been accurate enough when measured against my 3 other temperature monitoring options.