Egg Buddy | Thought this might be of interest. Just a little video of one of our Great Grey owl eggs in the egg buddy. It's a fantastic little machine. You can
Avitronics Egg Buddy - Lihne.cz
Buddy Mk2 Digital Egg Monitor by Avitronics - Mike's Falconry Supplies
Avitronics Egg Buddy MK2 Digital Egg Heart Monitor for Birds and Reptiles with adapter : Amazon.co.uk: Handmade Products