These things work great. 5mm was perfect. This 27-year-old Keithley 2000 multimeter had extremely worn out buttons that were barely functional. Practically brand-new now. Thank you!

Keithley 2000 meter button operation after repair pads installed:

Universal Button Repair Membrane assortments

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Keithley 2000 multimeter with ButtonWorx™ 5mm buttons installed onto circuit board