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One 3d printed plastic encoder knob compatible with Agilent/Keysight's 53230A frequency counter and units in a similar form factor. This knob was designed to replace the rubberized original (second picture on the right) and fits a 5mm D shaped encoder shaft and has an indent to accommodate the plastic "shroud" of the front panel that surrounds the encoder shaft.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.