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Important Information for our customers. Since 2008, the new CISPR 16 recommendations require some important technical changes to Line Impedance Stabilization Networks (LISN). We offer an upgrade for our LISNs to the new standard at reasonable costs. The following LISNs should be upgraded: NNB-2/16Z     NNB-4/16T NNB-4/32T NNB-4/63TL NNB-4/200 NNB-4/200X If you own one of these LISNs made before the production year 2007 we recommend to contact us.