Lascar el oem 3 oem component style voltage data logger and development board lascar el oem 3 the lascar el oem 3 is an oem packaged component style voltage data logger that measures and stores up to 64 000 voltage readings over a 0 to 24v dc measurement rangeit can be incorporated into new and existing products without the need to specifically develop a hardware and software platformthe user can easily set up the logging rate and start time and download the stored data by connecting the