PMS 4 S LMLH Laboratory Test Lead Holder with Safety Leads A comprehensive selection of 10 test leads supplied complete with a test lead holder, part of the Hircshmann Test and Measurement 4mm Safety system. These test leads are 100cm in length and come in a selection of colours, complete with 4mm Safety plug and stackable socket at either end with shatter proof housing and a highly flexible wire with built in damage indicator.