Here is a hint for measuring the pitch of the contacts - measure from the left edge of one to the left edge of the tenth one down. That way you will find 1.5" = .15" spacing or 1" = .1" spacing, etc. Much easier than trying to read tiny increments. Take it further and measure 30 pins = 4.5" so you have .15" or 4.68" = .156" spacing.