The EL-USB-LITE is a low cost USB temperature data logger with a measurement range of -10 to +50°C (+14 to +122°F) and a fixed sample rate of 30 minutes. The data logger can store over 4, 000 readings and is supplied with a coin-cell battery, which provides approximately 1 month's usage. By pressing the button a red/green LED indicates whether a preset alarm level has been met.