I have to agree with Al, here. The zero intercept of the TDS-1 seems to be stable and correct. It reads zero in good distilled water. It goes above zero as soon as anything is put in the water; ie., there's no dead zone. The scale is linear.
If there was an error of 20 to 40 ppm at the low end I haven't seen evidence of it. This isn't to say the PWT isn't the better instrument. It is. The TDS-1 is better than folks are trying to make it out to be, however. Be well, Mike D. > > Most of the Hanna TDS instruments have ranges of 0-999 PPM or > > 0-1999 with 2% accuracy of full scale. That means the unit can be > > off by as much as 20 or 40 PPM at the low OR high end of the range or > > at any reading. > > How can it be off 20 or 40 PPM at a reading of 1PPM ? Or even 10 PPM? > I think the accuracy statement means 2% @ full scale, not OF full > scale. > > My PWT accuracy statement says +/- 2% Full Scale. > > Al D. [Mike Devour, Citizen, Patriot, Libertarian] [[email protected] ] [Speaking only for myself... ] -- The Silver List is a moderated forum for discussing Colloidal Silver. Instructions for unsubscribing are posted at: http://silverlist.org To post, address your message to: [email protected] Silver List archive: http://escribe.com/health/thesilverlist/index.html Address Off-Topic messages to: [email protected] OT Archive: http://escribe.com/health/silverofftopiclist/index.html List maintainer: Mike Devour <[email protected]>
