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Protocol Test - Desiometer
Administration Procedures

GLOBE Assessment
Grade 9-12

Densiometer Protocol Test

The Air Temperature protocol test assesses students' ability to construct and use a densiometer.

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Construction & Use of Densiometer Protocol Test




Student activity & Level of Performance

+ appropriate student performance

- inappropriate student performance

n.a. not appropriate or not observed

















































Tube - 4 cm diameter 7 cm long

34 cm thread/floss

metal nut/washer















































Construct Densiometer














































Use string & tape to form crosshair on end of tube














































Leave some string hanging at bottom; use to tighten if strings loosen














































Attach both ends of 18 cm string with metal nut/washer across other open end of tube














































Hold vertically with metal nut/washer directly below the intersection of the crosshairs














































Use the Densiometer














































Look directly up at canopy; record vegetation that touches the crosshairs (+, -, Sky)
















































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