ok $29.95 Sears(can be found as low as $15)


good $70 at sears, these range from $50-$250 for middle end




great, if you're into tolerances, or just like to show off best you can have, otherwise you won't really have a need for these, but prices anywhere from $300+(saw a futek torque analysis system go for $3100 on ebay once lol)