ADVICE WELCOME!!! PLEASE GIVE ME TIPS!!! Professional safety testing equipment starts at $13,000. I'd like to build a cheap g-force meter to measure the effectiveness of pads. I'd like to use this to measure the impact absorbing properties of foam-block vs sprung subfloors. 1-3/4" mats vs 2" mats. Lawn (dirt & grass) vs 1-3/4" mats over concrete. And so forth.