HOW MAKE A SERIOUS COMPARATIVE TESTS PROCEDURE First rule Blind tests are mandatory to be serious. Second rule if you do not agree refer to rule number 1 😊 The purpose of this playground, and not to take into account the feeling of the prospector. It is too easy for a participant to indicate that he is correctly detecting the target. But in general he does not detect it or he thinks to detect it. It often detects a ground effect. During our long experience and our meetings wi