Tachometer Dimensions W x H x D: 48 x 24 x 50.7 mm Front panel cutout: 45 x 22.2 mm Operating temperature: -10...+55 °C Counter input: PNP, 4...30 VDC Operating voltage: - Power supply, internal: Lithium battery Backlight: Yes Display type: LCD Displays: 8-Digit Protection rating: IP65 (Front Panel) Termination type: Screw Terminal Character height: 8 mm Counting frequency max.: 30 Hz / 12 kHz