A used, excellent condition Technics SH-50P1 Electronic Stylus Pressure Gauge.
The SH-50P1 is an electronic, semiconductor strain gauge type, stylus pressure gauge for accurate setting of VTA (vertical tracking force). Originally supplied with the Technics EPA-500 tonearm, the SH50P1 was also available as an accessory for other turntables/tonearms. The unit features zero point adjustment and gain control mechanism.
Pressure measurement range is from 0.5-3g.