SLC-TR30 is a Ø 30mm test rod. The test rod is an opaque cylinder used after the installation of a safety light curtain to verify that no beams are bypassed due to the presence of reflecting surfaces. The test is carried out by slowly moving the test rod (Ø = resolution) in the center and then along each side of the protected area. During this procedure the green led on the receiver must always remain in the off state.