Lascar el oem 3 oem component style voltage data logger and development board lascar el oem test the lascar el oem test is a development board designed to assist in development of circuits using the el oem 3 data loggerthe el oem test features a mini usb connector battery socket and development options for input signal conditioning including positions for scaling resistors and an op amp circuit there is also a small bread boarding area provided with the interface designed and tested the