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The steady flow of calculator sales allowed MITS to run full page advertisements in ''Radio-Electronics'', ''Popular Electronics'' and ''Scientific American''. In the June 1972 ''Radio-Electronics'', MITS announced a 14 digit calculator (Model 1440) with memory and square root function for $199.95 kit and $249.95 assembled. The original 816 kit was reduced from $179 to $149.95. Both calculators could be controlled by upcoming programming unit.<ref name = "RE June 1972">{{cite magazine | title = MITS announces our forth generation. |magazine= Radio-Electronics | volume = 43 | issue = 6 | page =13 | date = June 1972}} Full page advertisement of the Model 1440 calculator.</ref>
The monthly sales reached $100,000 in March 1973 and MITS moved to larger building with 10,000 square feet (930 square meters) of space.<ref name = "Albq Tribune Apr 1973">{{cite news | last = Lucas | first = Urith | title = Albq calculator firm to expand plant, triple number of employees | work = The Albuquerque Tribune | page = C14 | date = April 20, 1973}} Summary: MITS to move to the Cal-Lin Building, 6328 Linn NE in May. Now at 5404 Coal SE. Employment is expected to rise from 62 to 180 or 200. Company will have 10,000 square feet on one floor. Calculator sales reached $100,000 in March.</ref> To meet the demand for assembled calculators, an automated [[Wave soldering|wave solder machine]] was installed.<ref>{{harvp|Roberts|Mims|1974|pages=74–83}} The "Calculator Manufacturing" section describes in detail how MITS produces calculators and has 10 photographs of the process.</ref> In 1973 MITS was selling every calculator they could make
The functionality of calculator ICs increased at a rapid pace and Roberts was designing and producing new models. The MITS 7400 scientific and engineering calculator was introduced in December 1972. It featured trigonometric functions, polar to rectangular conversion, two memories, and up to a seven-level [[Stack (data structure)|stack]]. A kit with a three-level stack was $299.95 and an assembled unit with a seven-level stack was $419.95.<ref name = "RE December 1972">{{cite magazine | title = A New Standard! MITS 7400 Scientific and Engineering Calculator |magazine= Radio-Electronics | volume = 43 | issue = 12 | page =17 | date = December 1972}} Full page advertisement of the Model 7400 scientific calculator.</ref> The next month the Series 1200 four-function pocket calculators were announced. The six-digit model was $59.95 and the twelve-digit model was $99.95.
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