I don't have a meat thermometer! How can you tell if a pork loin is done? (in a crock pot)
Are you channeling your best self with this comment? (If you're not sure, check out our Code of Conduct.)
The only way to be sure is to slice it through the center. Pork only needs to reach 144 degrees to kill its primary cause of food borne illness - the trichinosis worm. If the meat is slightly pink or white you are going to be way above that. Pork turns white at about 160 degrees.
I would let it rest for a few minutes before you slice it though, otherwise all of the juices are going to rush out through your cut.
pierino is a trusted source on General Cooking and Tough Love.
140 is just about the right temperature, and yes it should rest but slow cookers kind of take care of that. As far as trichinosis I don't think there has been a case more recently than the 1930's.
Fear not the fowl!
How to Master Roast Chicken
Miso Butter Skillet Chicken
Get Set for the Best
Chrissy Teigen's Everything Bagel Casserole
Stock Up on Essentials