Data loggers, in most cases, are easy to set up, and can be used as stand-alone devices without having to be attached to a computer. More importantly, the measurement accuracy offered by today's most advanced data loggers rivals the performance of many higher priced, PC-based data acquisition systems.
However, not all data loggers are created equal, and with so many choices available today, it can be challenging to know which one is right for your application. Do you need to measure a range of conditions, or just a single parameter? Does your application require alarm notification when conditions go beyond a certain threshold? Will the data logger withstand harsh environments? How often will you need to retrieve data?