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I've had Samsung, apple, lg and now back on apple. I've never had a problem with any of the screens scratching, and I've also never had a screen protector. What do you people do with your phones?!
Most likely to be a compatibility problem. I'm guessing you're using a different version of Excel at home?
Try checking for any updates, these usually include everything that's needed to resolve issues like this. You may need to manually download them depending on the versions being used.
I've had one like this for about 15 years, used it the other week to do my brakes and it worked perfectly.
http://www.eurocarparts.com/ecp/p/tools/car-service-tools/brake-service-tools/brake-system-tools/?SEAVS039&0&t5_390