Just received my idip 570 Marine purchased at Reef A Palooza Orlando. I've gone through three of the Alk test strip so far, but the only reading I get is "Er2". I've gone through the instruction video and written instructions, but I can't find what I'm doing wrong. Any suggestions? Anyone know what "Er2" is supposed to indicate? I tried checking the FAQ in the iDip app, but it was blank.