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UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: ALAN HAYNES on April 17, 2008, 11:23:53 am

Title: calibration solution
Post by: ALAN HAYNES on April 17, 2008, 11:23:53 am

can any body tell me how to use the



 solution is 342 ppm

i have two t.d.s meters and both reading 367 ppm does this mean they out of calibration

if they are can you change ppm or just replace

       alan

Title: Re: calibration solution
Post by: ALAN HAYNES on April 17, 2008, 11:28:15 am

went a bit pete tong
just got some calilabtion solution which is 342 ppm but my t.d.s meter reads 367 ppm can you change or just replace

Title: Re: calibration solution
Post by: michael papworth on April 17, 2008, 07:01:50 pm

Does it matter?

The only point on the scale that we really care about is between 000 and 005 or 006. As long as the meter is accurate down that end of the scale you don't really care about 350 or 400, do you?