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Many people are stupidly confused about the words data collector, pda, and smart handheld terminal. In fact, there is not much difference. In general, these machines are for collecting data, statistical data, and data transmission and communication, helping users to complete certain records, communication, data processing, payment and collection and other work. In fact, we can also say that pda, smart handheld terminal can also be said to be a data collector, and a data collector is a general term for the two. It is only differentiated according to the function and the occasion of use. Handheld terminal refers to a data processing terminal with WinCE, Android and other operating systems, memory, CPU, screen and keyboard, with data transmission and processing capabilities, its own battery, and mobile use. Generally speaking, the data collector refers to the handheld terminal with barcode scanning function, but not all handheld terminals with barcode scanning function are called data collectors. The operating system of the data collector is usually developed by the manufacturer. , For example, handheld computers such as POCKET PC and PALM with barcode scanning function are not called data collectors, and data collectors are also called inventory machines. Terminal computer equipment. With real-time acquisition, automatic storage, instant display, instant feedback, automatic processing, automatic transmission functions. PDA, also known as handheld computer, is classified according to its use and is divided into industrial-grade PDA and consumer PDA. Industrial PDAs are mainly used in the industrial field. Common barcode scanners, RFID readers, POS machines, etc. can be called PDAs; consumer PDAs include many, smart phones, tablet computers, handheld game consoles, etc. It can be seen that in many cases, there is not much difference between these words, and they are likely to refer to machines with the same function or application. So, for most users, how should they choose and differentiate? Generally speaking, data collectors, inventory machines, and multi-finger barcode data terminals are mostly used for barcode collection and serial number collection, mainly for barcodes. With the popularity of QR codes, data collectors and inventory machines have gradually integrated the functions of QR codes. PDAs and handheld terminals often refer to Android machines or WINCE machines. These machines are often powerful, also known as smart machines. Depending on the use case, the functionality varies greatly. Can contain one or more functions.