Go for the best Gyro tool !

SPT launch latest generation of North-Seeking Gyro,now incorporates the very latest technological advances, which makes it the best gyroscopic surveying instrument for the mining and Oil & Gas industries that need to ensure repeatable fast, reliable and precise downhole survey data as well as time saving and the highest return on investment.SPT north seeking gyro saves time and labour required to achieve results in a targeted time besides proving a boon to the environment.For more information, go through http://stockholmprecisiontools.blogspot.in/2013/09/spts-advanced-true-north-seeking-gyros.html