Answer: ylevel

AnswerCrossword Clue
YLEVELSurveying tool using a letter-shaped support
YLEVELSurveyor's instrument
YLEVELRotating surveying tool
YLEVELSurveying device with letter-shaped rests
YLEVELSurveyor's tool
YLEVELSurveying instrument