Most used on my main detecting gear belt is my Makro Pointer. It is a quick-adjust, 4-Sensitivity device that I usually have set at level '3' so I can quickly increase or decrease the Sensitivity level based upon my needs when pinpointing a target.
My 'back-up' pointer, so-to-speak, is my Nokta Pointer which has 10 Sensitivity levels. The factory default setting is level '5' but I like to keep mine set at '6' or '7' and make any ± changes as desired based on the site environment and potential depth of the located target.
I use the Makro pointer most often simply because when someone asks to borrow it to locate a target it is easier for them to adjust the Sensitivity. Both of these devices are waterproof so I prefer them during wet seasons also, and they are both in a very similar size and configuration, both working at 11.6 kHz and neither causes me any interference with any detector in my arsenal.
Always in my vehicle for any quick-hits when I am not wearing my gear belt I keep my 3rd pinpointer handy, and that is the Nokta RS Pointer. This is a slightly smaller-size and handy pinpointer that functions more like the Makro pointer in that it has 4-Sensitivity levels, that I also keep at level '3' but it does have a difference in that you can quickly select an Audio report or a Vibrate mode report, but not a combined Audio/Vibrate function. This pointer works at 8.8 kHz, and all three are powered by a single 9-V alkaline batter and last5 a long time.
Referring to your measured distances, I would suggest you double check the battery to ensure it is fresh and at, or close to, a full 9-V level. Also, double check the Sensitivity level the device is set for. Then, be sure to keep the pinpointer away from any metal, turn it On, then move the sample coin [size=small](as if laying flat-to-the pinpointer's tip)[/size] towards the pointer. On a US 10¢, 5¢ and 25¢ coin I easily do better than that at my typical settings. My Makro and Nokta pointers have been out-performing every pinpointer I had when I got my micro pointer 2½ years ago as well as all the pinpointers other folks use who have compared them side-by-side.
If you double check the battery, and set to a level '7' to '10' on the Nokta Pointer and can't get better performance than what you reported, I would encourage you to contact the Dealer you bought it from. If these is no quick assistance, then e-mail Dilek directly at Nokta and describe the results.
Monte