Singing Crown's hybrid book checker Book Checker B2 is released! Book Checker SMS-1339B Book Checker B2 has been released as a bookstore trolley model. The core technology of book checker B2 is the app that supports simultaneous collection check. It can be used in conjunction with BookChecker Manager PC. Unlike the existing collection check system, it will scan the collection management barcode and save it directly to the BookChecker Manager PC. Since the collection data is stored simultaneou