1. pencil type 2. plastic head 3. metal tube 4. 2 or 4 side plastic bar 5. ... . Chrome-plated plastic headSMT1192ASMT1192B-1SMT1192B-2Tip: Scales selection (bar, Kpa, Kg/cm2, psi)SCALE UNIT CONVERSION TABLE 1 BAR=100KPA EQUAL ... accuracy of gauge. pencil air gauge, auto air pressure gauge, 3 versions, SMT1192