Metrohm s/n 988853 500 V Insulation and ContinuityTester 0.6 Mohm and 3 ohm midscale, uses a PP7 9V battery complete with leads, cover and instruction manual. working, original knob missing Everett Edgcumbe & Co Ltd. Colindale Works,Hendon, London NW9 UK 1959/60

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