My Misco Refractometer Is Malfunctioning.

The most complete information can be found at https://www.misco.com.  Also, here is the link to the Misco Palm Abbe instruction manual: https://www.misco.com/Downloads/MISCO-MAN-PA20X.pdf.  The Misco Palm Abbe is the model of digital refractometer Smoky Lake Maple has carried in the past.