meter

$95... only used once to get my initial par readings worked great.

Okay so Hanna's Digital Salinity Meter requires calibration right? Could Hanna produce a Checker that did not require the purchase of calibration solutions? For example if a Salt Mix Pack says "Mix 1g of salt to 1 liter of water for 35ppt" Bearing in mind Hanna Calibration solution is 35ppt, you...

So I have a cheap (relative to other lights in this hobby) fluval reef 2.0 led and I've had a hard time keeping anything but softies and feel like I want to see about making a change to the lighting schedule or just swapping to a pair of used generic black boxes I got cheap. I really want to see...