magnetometer

"The recipe calls for a precise measure of baking soda. "

""The teacher marked specific points on the map where we needed to label the cities." "

"After the flood, we found strange deposits of dark, shiny rock in our backyard that were not part of the local soil. "

"The violinist was a master of her instrument."

"My brother uses the underground to get to work every day. "

"My sister is very helpful, especially when it comes to organizing things. "

"The smooth surface of the kitchen table was perfect for setting the dinner plates. "

"Keep going in the same direction."

"The geologist studied the rocks in the park. "

"The intensity of the music made it hard to concentrate on my homework. "

"a magnetic recorder"

"With only five minutes until we were meant to leave, the search for the keys started in earnest."