Why does it say

Why does my screen say full when I turn it on? I can't recalibrate or measure anything screen is stuck on full. I've changed batteries and no change. Is there anything else I can do to fix this?

crwdns2893858:0crwdne2893858:0 crwdns2893862:0crwdne2893862:0

crwdns2894050:0crwdne2894050:0

crwdns2889612:0crwdne2889612:0 0
crwdns2892346:0crwdne2892346:0