Another optical comparator that you may want to consider is the 
split-image type made by Metron Optics in Solana Beach, CA.  Phone (619) 
755-4477, FAX: (619) 755-4752.  Paul Kempf is the President and he is 
very helpful.

Ed Valentine
ProTronics, Inc.
Knightdale, NC
(919) 217-0007, FAX: (919) 217-0050
E-Mail: [log in to unmask]
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On Wed, 13 Dec 1995 [log in to unmask] wrote:

>      Does anyone have any personal experience with "image switching 
>      comparators" such as Vision Engineering's "comparascope". In a visual 
>      inspection process are there any substiantial benefits for this 
>      technique. 
>      
>      Any comments?
>      
>      DDrake
>      Lead Process Engineer - SSDS
>      (713) 987-4365
>      DRAKE@SSDSRDCC
> 
>