Unit question? Elementary physics class.?

A patient has a systolic blood pressure of 120 millimeters of mercury, What is the complete unit of this measurement?

I'm confused as to what they mean by "complete unit of this measurement" if anybody can provide an example of an appropriate answer it would be appreciated.

12 cm, maybe... but not sure !!

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Handcrafted in the MDF artisan tradition by master craftsmen since 1971.100% Latex FreeMDF Professional Aneroid Sphygmomanometer is the most popular blood pressure monitor offering durability, portability and accuracy ideal for medical professionals in the hospital, nursing home, clinic, or emergency medical setting.Gauge: A precise 300mmHg manometer attaining the accuracy of +/- 3 mmHg without pi...

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Omrons Advanced Positioning Sensor automatically confirms the monitor is at heart level, ensuring an accurate reading. This monitor is easy to use and not only provides systolic/diastolic and pulse readings, but also advanced diagnostics such as an irregular heartbeat detector and an average of the last three blood pressure readings. With simple, silent and one-touch operation, an accurate and reliable blood pressure measurement is seconds away. Cuff fits wrist sized 5 1/4 to 8 1/2 in circumference. Manufacturer: Omron Corporation Manufacturer Part Number: HEM-650 Manufacturer Website Address: www.omron.com Brand Name: Omron Product Model: HEM-650 Product Name: HEM-650 Blood Pressure Monitor Product Type: Blood Pressure Monitor Package Contents: HEM-650 Blood Pressure Monitor 2 x AAA Alkaline Batteries Storage Case Instruction Manual Warranty Card