well turn it on, go with the button to the last left position, and select accel. The it will display P 0, and you have to push the button and tilt the divice up until you get the correct weight, then release the button, and put it straight. when it is leveled you need to push the button and it will display -GO-. Just take off, but not like granny style 'cause it won't star measuring. after it starts it will display the current hp, and for no accel you get 0. measurements will stop when the car comes to a halt
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