As I see it in the picture, it's pretty obvious, that the hole moves with the handle. The indicator behind the hole is probably stationary, so moving the handle

As I see it in the picture, it's pretty obvious, that the hole moves with the handle. The indicator behind the hole is probably stationary, so moving the handle to the left makes the hole show red. By the way I think it's standard with hot to the left and cold to the right. Edit: He! Maybe there is no hole and the indicator is painted on the handle? If so, I agree.