Quote Originally Posted by Snowbdr1613
yea it says to calibrate with NaCl....it is a HM digital TDS-3....i got it on ebay... what would happen if i just kept using the high ppm water without getting a ROS...?/
Wouldn't you rather know the meter you just paid big bux for is right ?

Whats gonna hap if yu dont ? - All depends on what is actually in that 760ppm water - all calcium ? mg. ? chlorine ? flouride ? God knows bro.

Crispi :jointsmile: