The 500 scale is for U.S. The 700 scale is for Europe.
Opie Yutts Reviewed by Opie Yutts on . EC x 700 or EC x 500 I just received my trechion Cf meter that reads the EC and ppm but it has two break downs. One is EC x 700 and the other is EC x 500 Can someone tell me which reading I should be going by. Rating: 5