The Calcium Checker from Hanna could be the easy-to-use colorimeter for calcium testing that reef aquarists and LFS employees have always dreamed of. For those reef aquarium water testers who are either color blind or lack sensitivity between blue and…
Hanna Phosphate Checker Review: notable compromises still worth the resolution and portability
The Hanna phosphate checker is a green, egg-shaped hand-held colorimeter for portable testing of phosphate concentration with digital precision. If you’re like us, you’ve probably been wondering how Hanna could make such a small and affordable little colorimeter that could…
