Calculated Industries competed with the HP 12c in the mortgage and real estate markets by differentiating the key labeling; changing the "I", "PV", "FV" to easier labeling terms such as "Int", "Term", "Pmt", and not using the reverse Polish notation. However, CI's more successful calculators involved a line of construction calculators, which evolved and expanded in the 1990s to present. According to Mark Bollman, a mathematics and calculator historian and associate professor of mathematics at Albion College, the "Construction Master is the first in a long and profitable line of CI construction calculators" which carried them through the 1980s, 1990s, and to the present.
Calculated Industries competed with the HP 12c in the mortgage and real estate markets by differentiating the key labeling; changing the "I" "PV" "FV" to easier labeling terms such as "Int" "Term" "Pmt" and not using the reverse Polish notation However CI's more successful calculators involved a line of construction calculators which evolved and expanded in the 1990s to present According to Mark Bollman a mathematics and calculator historian and associate professor of mathematics at Albion College the "Construction Master is the first in a long and profitable line of CI construction calculators" which carried them through the 1980s 1990s and to the present