一些激光打印机使用光学感应传感器来测量墨粉余量。
Many laser printers use an optical sensor to measure toner levels.
这主要是因为先进的彩色复印机与打印机使用得越来越普遍。
This was largely due to the widespread use of advanced color copying and printing machines.
做为一些触摸屏机器上增加的额外设备，打印纪录的热像打印机使用起来很便利。
A thermal printer to produce a record is available as an added extra on some touch-screen machines.
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