Check the listing for details. Johnson Building Calculator Calc-1500 New. Condition: New, Made in China. Listed at 26.99 USD. The Johnson Construction Master Calculator #CALC-1500 is a handheld calculator designed specifically for construction projects. With its regular display size and key size, it offers convenient functionality for on-the-go use. Powered by batteries included, this calculator features advanced capabilities like right angle, run, stair calculation, pitch, and rise. The Johnson Calculator CALC-1500 is a reliable tool for construction professionals looking for accurate calculations in the field.The Johnson Construction Master Calculator #CALC-1500 is a handheld calculator designed specifically for construction projects. With its regular display size and key size, it offers convenient functionality for on-the-go use. Powered by batteries included, this calculator features advanced capabilities like right angle, run, stair calculation, pitch, and rise. The Johnson Calculator CALC-1500 is a reliable tool for construction professionals looking for accurate calculations in the field.