OK..................logged and noted. Now, what it your favorite chemical test for calcium? The one I use is pretty clear in results (going from pink to blue when appropriate level reached) Still, I thought it would be great to have a meter. Have you done comparitive studies to log your observations? Just how far "off" have you found the resulting readings on the Pinpoint to be? More than 5-10 points? It wasn't cheap so I'll appreciate knowing just what I'm getting for the money. Thanks!