Preheat the precision cooker using the temperature chart above for your level of doneness. Add salt and pepper to both sides of the ribeye
Place one steak in each vacuum-sealable bag along with a sprig of thyme. Seal the bags and place them carefully into the water bath once it's reached the right temperature. Cook for 2 hours
Remove steaks from their bags and pat them dry on both sides. Preheat a cast-iron skillet with oil. Sear steaks on each side for 2-3 minutes