application: any case to measure the rotational speed of a rotating object and to inspect the defect on its surface without te need to adhere any mark to reflect the light, and thereby without the need to halt the objecet from its rotation. dt-2350a,dt-2350b,dt-2350c, dt-2350d. product synopsis model: stroboscope dt-2350 measurement range (fpm) 0-12000 0-40000 0-20000 0-30000 accuracy: ±(0.05%n+1d) ranges: h.m.l flash adjust: coarse and fine flash tube lifetime: million times resolution: 0.01/0.1/1 power supply: ac 220v default ac 110v optional dimensions: 220x125x125mm weight: 680g