110VAC. Range 100 to 10,000 rpm. Accuracy: plus/minus 6.05 percent plus 1 digits. Xenon flash tube. Display: 10mm Red LED. A/C or battery power. Xenon flash tube. Display: 10mm Red LED. Range: 100-10,000 RPM. Accuracy: plus/minus (0.05 percent plus 1d). Size: 8.3 x 4.7 x 4.7 in. (210 x 120 x 120mm).