A data logger analyzes temperature data associated with a product passing through a conveyor oven and provides a visual indication indicating whether the product's temperature profile is within acceptable limits. Thus, an operator need not download captured temperature data to a computer in order to determine whether the oven settings produce a product profile that is within acceptable limits. In one embodiment, the data logger stores criteria for an acceptable product profile, and collects the temperature data and analyzes whether the temperature profile data is within the acceptable limits of the criteria. In another embodiment, a button and a pass/fail indicator are located externally on data logger. An operator depresses the button in order to request whether the product profile passed or failed the criteria. In response to depressing the button, the pass/fail indicator provides visual indication of whether the current oven settings produce an acceptable product profile.