THE  QUALTRONICS   INSURANCE PREMIUM COMPUTER

Although this looks like a large calculator it is actually an early specialized application of a computer.
Based on the " Rockwell AIM 65 interactive microcomputer" .  This  computer stored insurance information used to calculate premium rates.  It had a twenty character LED display just above the keyboard and a small on-board printer.  It could be programmed in BASIC, FORTRAN, ASSEMBLER,  and other computer languages of the time.

THE WATER WIZARD
POOL WATER ANALYSIS COMPUTER
This computer used optics to analyze swimming pool water for customers of pool chemical retailers.
The customer would bring in a sample the computer would analyze, then print out a list of chemicals together with complete instructions as to what had  to be added to the pool to correct any abnormal conditions.