Yes i was at a garage sale today and i saw this square box, the owners said it dose not work, so i bought it anyways, so in disbelieve of the owners i decided to do a test anyways on a car battery and it WORKS!!!! i guess they dont know how to use it,

5 buck of an 1948 multimeter is a steal... here some pics of it
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Current Garage
2008 Mercedes GL320 CDI 188k mi Repair/Work in progress
1994 S350 160k mi Garage Queen & prepping for repairs
2005 E320 CDI 203k mi Healthy & Daily Driver
1994 S350 357k mi Retried as parts car
1984 300TD 214k mi Blown OM617 Poss OM603 Swap??
Sold
1987 300SDL 200K+
1994 S320 181K mi
2008 E320 Bluetec 127k mi
1999 S420 130K mi
1980 240D 360k mi
15+ Others that has come, stay and gone
GONE, BUT NOT FORGOTTEN 
1995 E320 SE 220k mi
1984 300SD 350k mi