Lascar el bt 2 bluetooth wireless temperature and humidity data logger lascar el bt 2 cal th the lascar el bt 2 is a bluetooth wireless temperature and humidity data logger that can be used in conjunction with a mobile android device to provide accurate temperature and humidity measurements the easylog bt app for android8482 is available on google play8482 and allows you to manage your el bt 2 logger with easethe user can easily set up the logger and view downloaded data remotely on