Rapid mini usb dataloggers rapid 52 3301 this mini light level illuminance datalogger is in the form of a battery powered usb stick so no cables are required to retrieve the data the sensor memory and battery are all enclosed in a single unit so no additional hardware is requiredthe sample rate can be set between once per second and once per hour so the 16 384 sample memory can store from 4 hours to almost 2 years of dataoperate in just 3 easy steps 1 insert the data logger into the