Ultrasonic distance measure

Hi eveyone, I'm an assistant cameraman in film and tv and sometimes I've hired in a  professional distance measure device to help with really tricky shots. Trouble is, to buy one costs an arm and a leg, I was just wondering if anyone here had come up with an affordable version. The device sits on top of the camera and sends out ultrasonic pulses to where ever it's pointing and displays the distance in feet and inches on a LED display, that constantly updates. That's all it needs to do. Should have a range of 2' to 15' and be +/- 1" accuracy.
Any help would be greatly appreciated.

Heck, the laser distance measurers are less than 150 bucks now - accurate to 1/8"

Steve
caitlinsdad5 years ago
Maybe hack a smaller ultrasonic tape measure. http://www.sears.com/shc/s/p_10153_12605_SPM2032987801P?sid=IDx20101019x00001a&ci_src=14110944&ci_sku=SPM2032987801 Disable the beep and laser dot and rig it up to constantly take readings.  Since the max distance is only 15', it should be pretty accurate and small enough to mount to the camera. Good luck.