This 1958 ad shows a number of Triplett VOMs... What a line-up!
My 1971 Allied catalog lists the following 630 models:
630......Standard Bakelite 2% 20K ohms/VDC .............$64
630A.....Bakelite 1-1/2% 20K ohms/VDC.....................$75
630PL....Plastic meter face 2% 20K ohms/VDC.............$64
630PLK..Similar to above, with transistor "fuse"............$98
630APL..Similar to 630PL, 1-1/2% mirror scale.............$75
630NA...Similar to 630APL, but with "gearshift switch"...$98
630NS...Similar to above, but 200K ohms/VDC............$116
630M....Similar to above, but 1meg ohms/VDC............$231
631......VOM/VTVM 11 megohm DC input resistance.......$86
Also:
666R....Small Handheld 5K ohms/VDC..........................$46
310......Compact handheld 20K/5K ohms/Volt AC/DC.......$44
310C....Compact handheld 20K/15K ohms/Volt AC/DC.....$56
310FET..Compact handheld 10 megohm DC input ...........$74
Lots of fine (too many?) models to choose from.
jr
Geoff Bourquin: That 630NS sounds like a fine meter!
I have never used a Simpson 260 but enjoyed using a 269 (with 7" mirrored scale) many years ago.