Just bought one of these.....
http://www.brinsea.com/p-394-spot-check-digital-incubator-thermometer.aspx
Check these out....
https://www.cutlersupply.com/collections/gqf-incubators-and-hova-bators
I highly recommend a circulated air hova bator. I have a 2362E that I have been using for 4 years now. I pack it away and pull it back out and almost never need to mess with the temperature now that it's set. I don't think they make that model anymore but I'm 100% sold on GQF. I use my old GQF cabinet most of the time now with just the hova bator to hatch in but it's on all through hatching season (hatching weekly)