Getting Started with the Cardio Calipers
After you've installed the Cardio Calipers you should find using the tool straightforward. You can use the tips below to get the most out of the Cardio Calipers and measure like a pro.
To use the Calipers drag them over the portion of an EKG you want to measure using the mouse. To extend the calipers drag the right hand side out using the mouse. The number in the text box will show the space being measured. The Calipers have several buttons which may appear differently on different skins. The arrow buttons on the slider will allow you to move and rotate the Calipers to measure any distance. The Diagonally downward pointing arrow hides the Calipers in the System Tray. All the controls can be accessed through the keyboard:
| Arrow Keys | Move Calipers |
| Shift + Arrow Keys | Extend Calipers |
| Ctrl + Arrow Keys | Move Calipers by 10 Pixels |
| Ctrl + Shift + Arrow Keys | Extend Calipers by 10 Pixels |
| Shift + > | Rotate clockwise |
| Shift + < | Rotate counter-clockwise |
| C | Cycle Color |
| K | Cycle Slider Color |
| F | Rotate to nearest 45 degrees |
| L | Rotate to last 45 degrees |
| A | Toggle Lock Angle |
| M | Toggle Lock Measurement |
| N | New Set of Calipers |
| U | Cycle Unit of Measurement |
| Q | Quit |
| H | Hide in System Tray |
| F1 | Show Help |
| Ctrl+C | Copy Value to Clipboard |
| Ctrl+V | Paste Value from Clipboard |
| Z | Undo/Redo Movement |
| Doubleclick mouse | Flip between horizontal and vertical |
| Right-click mouse | Show Calipers menu |
While Dragging the Base:
| Shift | Limit movement to 45 degrees |
| Alt | Limit movement to angle |
While Dragging the Slider:
| Shift | Lock Angle |
| Alt | Lock Measurement |
| Ctrl | Override 'Sticky Angles' |
By typing a number and pressing 'Enter' the Calipers will extend to that distance. Simple calculations may be performed by typing -, +, *, or / and then a number, then 'Enter'; the Calipers will extend to the new relative position. When Closed the Calipers sits in the System Tray. By Right-clicking anywhere on the face of the Calipers, or clicking on the System Tray icon the Calipers menu is displayed: The menu is divided into four sections:
| Units | Change the scale of measurement |
| Skins | Choose a new user interface |
| Options | Access more options |
Additionally there are the options:
| Show Millimeters | Change Units measured to Millimeters |
| Show BPM | Change Units measured to Heart Rate in Beats Per Minute |
| Show MilliSeconds | Change Units measured to MilliSeconds |
| Show MilliVolts | Change Units measured to MilliVolts |
| Set Calibration to 20mm | Calibrates Calipers so that the current measurement corresponds to 20mm |
| Paper Options... | Opens the Paper Options window to change mm per Second and mm per milliVolt |
| Sticky Angles | Snap rotation to nearest 45 degrees |
| Lock Angle | Lock angle when dragging |
| Lock Measurement | Lock measurement when dragging |
| Exit | Close the program |
The Skins menu presents several different choices for the user interface of the Calipers. By choosing the "Get More Skins" menu item you will be taken to the Cardio Calipers skin webpage. This allows you to browse and download new skins. Full instructions are given on the webpage. The Options menu contains a sub menu of the following options:
| Stay On Top | Controls floating above other windows |
| Show Color Bars | Shows/Hides edge Color Bars |
| Show Tooltips | Shows/Hides info popups for buttons |
| Run at Startup | Opens Calipers when computer starts |
| Hide Splash Screen | Hides the picture at startup |
| Center On Screen | Moves the Calipers to screen center |
| Help | Shows Help |
| Unlock Advanced Features | Accepts your serial number |
| Visit Website | Links to Caliper homepage |
