The Pelican Case provides IP-67-rated waterproof case for the Impact-O-Graph and Digi-Shock. The Pelican Case is watertight, crush-proof, and dust-proof. The case has an automatic pressure equalization valve that will balance interior pressure but also keeps water out. Use with the Impactograph Analog Impact Recorder, the Digi-Shock G and the Digi-Shock GT. The protective case offers 0pen cell core with solid wall design so that it is strong and light weight.