Features The input adopts the common contact signal, the selection of the sensor is simple and convenient, and the counting is accurate and reliable. Panel and external can be zero-clearing, anti-shock design, effectively prevent data loss. 6-digit large-screen LCD display with low power consumption and long battery life. Maximum counting speed reaches 20 times / sec. No mechanical wear, reliable working, long service life. Specification:Item Type:Counter Brand:BERM Product Model: BEM-6C Power Supply Type: Built-In Battery Battery Model: AA R6P Voltage: 1.5V Capacity: 1500mA Counting Range: 0-999999 (6 Digits) Counting The Highest Frequency: 20Hz Count The Minimum Pulse Width: 1mS Contact Maximum Resistance: ≤1KΩ Contact Disconnection Minimum Resistance: ≥500KΩ Clear Mode: Panel / External Operating Ambient Temperature: -5℃ ~ 40℃ Size:64 x 38 x 38mm / 2.52 x 1.5 x 1.5in Opening Hole Size:61 x 36mm / 2.4 x 1.42in   Package List:1 x Counter Package List 1 x Counter