The units for the accelerometer are g-force (g), and the units for the gyroscope are degrees per second.
To find this information (for those who later come across this post with similar questions), you can go to the API page
, and select your Phidget and class from the drop-down menus. You can see the attached screen-shot for details.
How quickly are you moving the accelerometer? The spatial is able to measure up to 8g on all axes. You should see spikes in the reading above 1 if you shake the accelerometer hard enough.