Einstein wasn't an inventor. Although, if he had wanted to be he would probably have been a rather good one. He was a theoretical physicist. He concepts (and supporting mathematics) are used every day in various fields, including astronomy, mathematics, physics, space travel, communications, and many others. He didn't just come up with a couple of interesting concepts. His work changed the nature of physics and related sciences.
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One of Albert Einstein's discoveries was the photoelectric effect. This concept is used in making smoke alarms, burglar alarms, lux meters, photometers, etc.
Scientists used it to develop Nuclear Power
It is not used in medicine.
In physics, mass-energy equivalence is the concept that mass and energy are the same thing. This is better known in its formula E=MC2 developed by Albert Einstein, which led to nuclear binding (and splitting?) which ultimately provided the basis for the atomic bomb.
Aquaducts, cement, roads, domed shaped roofing, andalso they were the first ones to have written laws ;)
Einstein used tools to make his inventions. He probably use an old fashion microscope to study microscopic things but that is all that I know:( Hope it answered your question!