Bach-Simpson Ⅲ S (Canada)

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unit face
u4315-face.jpg
meter
u4315-meter.jpg
panel
u4315-panel.jpg
ad'
period advertisement
catalogue
1957 Simpson catalogue
manual
34 pages user manual
including schematic
repair & service
Repair & service manual
including schematics
batteries
batteries
1 x D cell & 4 x AA
catalogue
circuit board
internal - top
internal - top
internal - left
internal - left
internal - right
internal - right

Quick reference - Bach-Simpson Ⅲ S (Canada)

retailer/manufacturer figures

Circuit board marked:
'Series - 3' and '1-116648'
DC voltage 2.5V, 10V, 50V, 250V, 1000V
20KΩ/volt dc ~ 3% of full scale
AC voltage 2.5V, 10V, 50V, 250V, 1000V
5KΩ/volt ac ~ 3% of full scale
DC current 100μA, 10mA, l00mA, 500mA
Accuracy 3% of full scale
Resistance Rx 1Ω, Rx 100Ω, Rx 10KΩ
Accuracy 3° of arc
Decibels +10, +22, +36, +50dB
Dimensions 178 x 140 x 80 mm / 5¼ x 7 x 3⅛ inches
Weight 1.36 kg / 3 lbs / including battery
Battery 1 x 1.5v D cell & 4 x 1.5v AA
This example Bach-Simpson version from Canada - components marked Canadian.
meaning of 'S' after the series Ⅲ ?