Check the listing for details. Starrett 657 Magnetic Base Indicator Holder Push Button On/Off. Condition: Used, Made in United States. Listed at 90.00 USD. Any questions feel free to ask. The Starrett 657 Magnetic Base Indicator Holder is a high-quality unit designed for precise metalworking inspection and measurement. Made in the United States by the renowned brand Starrett, this push-button on/off holder securely attaches to a magnetic base for convenient and accurate indicator readings. With a single unit quantity available, this magnetic base indicator holder is a reliable tool for professionals in the CNC, metalworking, and manufacturing industries.