The
fifth of the Weston Master series, this meter was made only in the UK,
starting in 1963 and continuing to 1972. Model S461 in the UK and 748
in the US. It is very similar to the EuroMaster (Europea in the US)
which followed it. Aluminium with a beige-gray plastic case, they
were not readily available in the US and not widely sold in the UK so
fully working models command a good price on Ebay.
The
old scales foot-candle (lumen) scale was replaced by an arbitary 2-10
and 10-16 scale. ASA to 16000 (DIN to 42), f1-32, 90 sec - 1/1200 and
arbitary scale numbers of 2-10 and 10-16.
Models
exported to the US have a Weston Instruments and Electronics branding
although later models show Weston Instruments Inc after the takeover of
Daystrom by Schlumberger.
The
nice very useful slide needle lock of the Weston IV is replaced by a
stupid fiddly tiny button which was retained on later models and it the
main reason I kept using my IV.
The meter shown here has never been unpacked let alone used and works perfectly. It cost me £10!
