A quick question here: If the start color for one of the tests is blue and the end color yellow, may I assume that if I add a drop and it turns green that it is a half degree (ex: 7.5 dGH instead of 7 or 8)? If another drop is added, it turns to the final color. Thanks, Cavan __________________________________________________ Do you Yahoo!? HotJobs - Search new jobs daily now http://hotjobs.yahoo.com/