Digital Event Counter Model 260-2596
Technical Characteristics:

Display: 6-digit, LCD, 0.2" high

Power: 3 volts

Battery: Lithium

Count input: Switch contact or solid-state transistor switch

Count speed: 100 counts/sec

Operating temperature: -30° to +75°C

Weight: 3 oz without batteries
Applications:

260-2596 is useful for counting rain gauge tips at sites where monitoring equipment has no local display capability. This unit provides years of silent operation without mechanical wear and is self-powered with a 2-wire connection that eliminates power wiring.
Make the download of the datasheet