These units can all be used hand-held to detect and record bats.
The Anabat Walkabout, M500 & M500-384 and Wildlife Acoustics EM Touch 2 all have real-time sonogram display (Pettersson M500/M500-384 & Wildlife Acoustics EM Touch 2 when connected to suitable device) and the Anabat Scout (coming soon), Peersonic RPA3, Elekon Batlogger M and Pettersson D240X & D1000X do not.
The EM Touch 2 connects to compatible Apple or Android devices.
If the real-time sonogram display is important to you, I recommend either the Anabat Walkabout or the Wildlife Acoustics EM Touch 2 PRO. If you don't want the display it would be the Elekon Batlogger M (which can be used passively as well) or the Anabat Scout (coming soon).
Choose whichever one has the features that suit you best and if you need help choosing, give me a call on 0333 9000 927 (+44 333 9000 927 from outside the UK) or email me.
You'll get a free bat calls book worth £30: either British Bat Calls by Jon Russ, Social Calls of the Bats of Britain and Ireland by Neil Middleton et al or Bats of Britain & Europe by Christian Dietz & Andreas Kiefer; with the Anabat Walkabout, Elekon Batlogger M and Pettersson D240X & D1000X.