4Bit Red Digital Display Trigger Counter (15147) from ICStation on Tindie
High Speed Counter Module (1 encoder) PLUS - EZIOP-HSCM2
Mini LCD Digital Counter Module DC/AC5V~24V Electronic Totalizer with NPN and PNP Signal Interface 1~999999 Times Counting Range: Amazon.com: Tools & Home Improvement
YF-16 Trigger Frequency Counter Module Accumulator 6-Bit Red Digital Tube Display PNP NPN Signal
Characterizing A Cheap 500MHz Counter Module | Hackaday
Digital Counter Module Dc/ac5v~24v Hour Meter Mini Calculator Electronic Totalizer With Npn And Pnp Signal Interface - Counters - AliExpress
783407-01 - Ni - Counter/Timer Module, NI-9361, 8 Channels
DC 5V 12V 24V Trigger Counter Module MOS Delay Circuit Switch Timer 32-Function
CD4026- 1 Digit Up Counter Module - BuildCircuit.COM
Event Counter Modules
Mini LED Digital Counter Module DC/AC5V~24V Electronic Totalizer with NPN and PNP Signal Interface 1~999999 Times Counting - Walmart.com
Amazon.com: Ranjaner 1Hz-50MHz Frequency Counter Kit, DIY Module Board for Oscillator, Crystal Measure Frequency Meter Accessories : Industrial & Scientific
0-10KHz Pulse Frequency Delay Module, DC 12V Pulse Counter Module High Level Trigger Relay Module for Motor Speed Sensor (Without Shell): Amazon.com: Industrial & Scientific