In the quiet machinery of industrial manufacturing, Tempsens Instruments — a maker of temperature sensors and heating systems since 1990 — stepped into the public markets and found the crowd waiting. Its ₹650 crore IPO drew demand more than 21 times over by the second day of bidding, with grey market traders pricing in a doubling of invested capital by listing day. The episode speaks to something enduring in market psychology: even unglamorous, essential businesses can ignite speculative ardor when growth and scarcity converge.