Do they act like servos or motors?
Are they some how settable or programmable such that its normal balanced position is half of the stroke or is that something done via software?
And if it doesnt act like a servo how does it know how far out it has extended?
Or are they all the same strength going in and out and thats marketing?
Turn your L16 -P into a Linear Servo using the LAC board listed in the "Controllers and Switches" section here. This combination has all the same functionality as the L12-I plus USB support, speed control, sensitivity control, position control, and adjustable end limits.
if you have the hbridge and the internal pot and an arduino why do you need the 9g servo?the hbridge gives you the in and out and the pot tells you where you are. Then an arduino sketch to mash them together?