Chemglass IKA digital hotplate/ stirrer dry magnetic hot plate safety disc

Description

Used   Chemglass  digital  hotplate/ stirrer . Hot/stirring plate diameter 5.5 inches, rotation speed variable 0-1100 rpm. 115v, The speed regulator  works fine , the heating was not observed - the unit does not work as hotplate, only as a magnetic stirrer. Upon powers up shows temperature (room) temp and rpm, after several minutes of work shows Err 25, though hold the rpm set up lot ulstcentbot