Methods are disclosed for pulling an object while measuring the weight of the object. Red, green and blue light emitting elements are driven to emit corresponding colored rays of light to thereby provide white strobe light. If an inadequate-recording-state determining section detects a recording inadequate state, a recording suspending section instructs the recording gaterecording data creating section to suspend outputting the recording gate and the recording data. This may achieve a reduced trap density as well as reduced segregation resulting in a spectral luminescence profile revealing a single narrow peak with a high level of photoluminescence. The first device may send a first frame to a second device for requesting data frames that are pending at the second device.