The AT6181DL kit includes a stroboscope disc along with a quartz strobe light, giving you everything you need to precisely check your turntable's rotation speed. The light’s yellow LED provides a clear, accurate reading of the stroboscope’s high-contrast markings for 33-1/3, 45 and 78 RPM speeds. Stroboscope disc also includes an overhang guide.

Specifications
Stroboscope Disc
Speeds: 33-1/3 RPM, 45 RPM, 78 RPM
Dimensions: 104 mm (4.09") diameter
Weight: 35 g (1.23 oz)

Strobe Light
Frequency:
33-1/3 RPM, 45 RPM: 120 Hz
78 RPM: 234 Hz
Battery: AAA (alkaline or nickel-hydrogen) × 2, sold separately
Battery life: Approx. 8 hours (continuous use)
Dimensions: 32 mm (1.26") W × 19 mm (0.75") D × 115 mm (4.53") H
Weight: 35 g (1.23 oz), without batteries