The Autonics LR5N Rate Meter is a self powered unit which has a replaceable lithium battery.
The LR5N can display RPM, RPS or frequency. The Autonics LR5N Rate Meter has a flexible input range of 30-240 vac or non contact, NPN, or PNP.
This compact unit W48 x H24 is small in size but has a large number of features. These Autonics LR5N Rate Meters are a low cost solution for measurement of machinery speed or counting using a time base.