PMS 4 LMLH Laboratory Test Lead Holder with Leads A comprehensive selection of 10 test leads supplied complete with a test lead holder, part of the Hircshmann Test and Measurement 4mm system. These test leads are 100cm in length and come in a selection of colours, complete with 4mm caged plug and stackable socket at either end with shatter proof housing and a highly flexible wire with built in damage indicator. The wall mounting kit comes complete with 30 plastic brackets and fastening kit and is capable of holding 100 measuring leads.