The digital display features an analogue bar graph, low battery and freeze functions (peak hold) and an automatic backlight function. The control buttons comprise an ON/OFF button and a MODE button. The carrying case is made of lightweight, high-quality material and protects against moisture.
The RS232 interface can be used for direct connection to a computer with the Excel add-in for Windows (451EXL). This software makes it possible to call up information, select user parameters and provides a virtual instrument display with audible (requires sound card) and visible alarm indication.