Figure 1. GM70 basic display 1 Battery indicator. Shows the current status (charge) of the battery. 2 Icon that indicates that GM70 is communicating with a PC. If the PC cable is not connected, this icon is not shown. 3 Pressure and temperature settings. 4 Selected parameters (ppm or %). 5 Function key Graphic shows the readings as a curve. 6 Function key Hold/Save freezes the display and you can save the reading in MI70 memory. 7 Function key Record is a shortcut to the Recording/Viewing menu. You can change the default function key shortcuts (Graphic, Hold/Save, Record) to other menus or functions in Main menu > Settings > User interface > Program shortcut keys.