Lampex Handheld Device is a solution that uses IoT to help industrial billing system users perform billing tasks in a convenient and efficient way. It is a handheld device that is developed using QT and integrated with a GPIO-based matrix keypad along with ST7701 LCD panel. It allows the users to enter and display keypad values on the LCD panel, using GPIO interrupts. It also uses QT creator to create user applications to interact with the driver and serve the purpose as required. By using Lampex Handheld Device, users can improve their billing accuracy and speed, and reduce their operational costs and errors. The first version of Lampex Handheld Device was based on Core9G25 chipset. This model included monechrome matrix display. Later on, the device was upgraded to Qualcomm MSM8909 Chipset, and the display to TFT colour type.