My knees were sore and the service person told me where the HP paper was located. It wasn't there but then he walked over to another area and got my paper. The next day I needed the ink and another service guy looked up the right ink and saved me from going thru all the models and thier ink supply. Hate to be a grumpy old man but some days the knees don't feel good at all. I appreciated their help instead of just sitting and watching me.