H7CX-N Digital Counters & Tachometers Omron H7CX-N Digital Counters and Tachometers are designed for ultra-compact size, better display readability, isolated power supply, and input circuits. These counters/tachometers feature a shorter body depth of only 59mm, easier-to-read preset value display characters, isolated power supply, and input circuits. The present value display characters can be switched between green, red, and orange. The counters/tachometers have an upper-limit setting to prevent operator errors and an output-counter for monitoring and issuing an alarm when preset count is exceeded.