will this work to find underground water leaks?

Dear Denis,Please see below the manufacturer's reply to your inquiry:"We have had customers tell us they have been successful finding underground leaks with AccuTrak (when underground leaks were about 2 feet down and additional pressure was added), HOWEVER, the AccuTrak was not designed to do this, and we can't guarantee it will always be effective. Remember, AccuTrak works on sound, so the leak must be quite large for its sound to penetrate solids like sheet rock, insulation or soil and concrete. There are other instruments on the market which detect LOW frequency sound, and were designed for these types of applications, however the same problems seem to exist even with these types of instruments."Regards,Den Pyrlia

Does this prod. Comes w/ calibration certificate?

Dear Ruben Antonio,Thank you for your recent inquiry.The manufacturer confirmed that the calibration certificate can be added for a cost of $234.00. There would be an additional lead time since the calibration is done at the factory and the certificate would be done at time of manufacture.Here is the manufacturer's link for your kind reference on the requested item:http://superiorsignal.com/products/ultrasonic-instruments/accutrak-vpe-1000-ultrasonic-leak-detector?utm_source=accutrack-vpe-1000&utm_medium=old%20URL&utm_term=accutrack-vpe-1000&utm_content=accutrack-vpe-1000&utm_campaign=HikaShop%20URL%20RedirectsPlease confirm if you would you like to procced with the order.Thank you,Marcus Cain