Hioki DT4255 [DT4255] True-RMS Digital Multimeter, 1000V AC/DC with Fuse-protected Terminals.The Hioki DT4200 Digital Multimeter Series consist of a complete lineup of 9 models ranging from professional to industrial to pocket meters, delivering a super fast response rate and safety features that take electrical testing to a higher level. The DT4255 is a digital multimeter designed for maximum safety with voltage measurement terminals that are protected by a fuse.