Mine is a different device, it's a 19. I had an issue with an iclear30 shorting out but it read 1.5 on the meter. Perhaps put your atty on like normal, then remove the the top with the atty still attached. Measure resistance between the pin and top. On mine, when I tightened the clearo the pin was too tall causing the atty to short, but i would take it off and it would measure right. I ended up replacing the pin with a screw so I could adjust the height.