... vessl 1, Feature (1) LCD digital display products work, builtin timer, automatic travel, can show the standard time.(2) LCD digital ... , Scope of application(1) Flammable and explosive gas medium.(2) Explosion-proof mark dⅡBT4/IP65.3, Structure1,welding pipeline2,Base flange ... to the needs of user: can be installed flag type explosion-proof digital display or electric, light and sound signal source;8 ...