Q - I purchased a Cornet ED 15. I returned it because the display was too jarring/disturbing for me visually, but also because I seemed to get EHS symptoms from the meter. Do you think it's possible that I reacted to the 9V battery and would be better of with a meter that runs on AA? I have a Trifield XE100 that I have no trouble using.
A - Both TRI FIELD 100XE and CORNET ED15 and ED78 and ED88T have a 9V battery. The difference is that the TRI FIELD 100XE is analog and the ED15/78/88 are all digital and have a circuit board with digital electronic (chips). So my guess is that you reacted to EMI (mid frequency) electric fields.
I still suggest to get a ED88T so you will be able to see the RF radiation which the TRI FIELD 100XE don't show.
You can use it with a universal phone holder - like this one - http://www.ebay.com/itm/Universal-Car-Windshield-Mount-Holder-Cradle-Stand-Bracket-For-Mobile-Cell-Phone-/231746947358?hash=item35f531c91e:g:f2kAAOSwT5tWQBVh
These Universal phone holder can be used by EHS people to hold the EMF meter without touching it as some EHS will react to the EMI and electric fields emitted by the EMF meter.