I just wanted to add that I couldn't imagine pressing rosin without my nano beside me. Besides a vape (and a hand warmer), it has become a tool I regularly use while doing my other stoner tasks. When I'm loading any concentrate, it's my heat to warm up my dab tools for use or cleaning.
Just hovering a dab tool over the heater is enough the warm the metal and/or the dab sitting upon it. I use it to melt a dab of rosin before I smear it on my organic cotton for vaping. I then warm the dab tool again to wipe off the residue.
It's also how I soften rosin on parchment for collecting that has cooled to a brittle shatter. I then use the heat to shape the collected rosin into a disc or whatever shape you wish.
I have sat a 7g, thick-bottomed glass concentrate jar on top of the nano where it rests on the wood without making contact with the heater. You can then heat up a sample of rosin to change its consistency, or potentially decarb it at whatever temp you wish. I have not intentionally tried the latter but see it as a very viable option.