I have a couple of old meters ,volt and amp meters, on each face, below the scales, is the inscription"B S 1st.Grade" and directly below that "1918". Does this mean the meters were made to BS 1st Grade in 1918, or that the grade was introduced in 1918 and the gauges could be have been produced after this date to that grade? I thank you in advance for any info or pointers. Regards, Dave Carter.
- posted
19 years ago