Heidolph MR-Hei-TEC Magnetic Stirrer / Hotplate 505-30000-01-3 - Fair Condition 135019758355 however the screen stays frozen

however the screen stays frozen and error ERFF pops up

There is a small mark in the inside bottom corner and it appears to be a burn mark

Manufacturer HIDEit Model Number na UPC 858691006012 SKU 19-85832 Ref 23-124679

Manufacturer Cisco Model Number N2K-C2348TQ-10G-E SKU 19-73370 Ref 23-105161

Manufacturer Chemglass Model Number CG-4516-15 SKU 19-87699 Ref 23-127910

Heidolph MR-Hei-TEC Magnetic Stirrer / Hotplate 505-30000-01-3 - Fair Condition 135019758355 however the screen stays frozenCondition Used Description This item is fully tested and in excellent working order. Item will come with a 30 Day Warranty. Cosmetically in fair condition showing moderate to heavier scuffs scratches blemishes from previous use. Includes Magnetic Stirrer Hotplate, AC Power Cable, Temperature Probe, and Stand as pictured. No additional items or accessories are included. Photos are of the actual unit for sale. Inventory is on hand and ready to ship.