Honestly, with the Target Trace images on the SmartScreen, the TID number isn't as important to me as it may be some others. To me, it is more convenient to watch those icons move around the screen than to try and keep up with the numbers. I'm more of a "hunt by ear" kind of guy. But, if I were going by the numbers, I'd have more confidence in the PP numbers due to PP being an all metal AND non-motion mode. Being able to S-L-O-W the coil down to a snail's pace helps me get those FE numbers to "lock on" with PP. It has been my observation that the CO numbers are fairly consistent with hunt and PP. But the ferrous numbers can vary quite a bit, depending on the target. Coins-----not so much. But iron and even pull tabs will make those FE numbers dance away from the 12 line when using PP. Regardless, having the ability to see multiple targets under the coil simultaneously is a huge step from previous technology. We just have to develop our own method of sorting them out. JMHO HH Randy