Al-Sci Field Sieve-Gravelometer

The accurate and fast way to collect data on stream bottom materials! Makes pebble size determination faster and more consistent than using a ruler when using the Wolman pebble count procedure for stream classification. The square openings measure particle sizes ranging from 4 mm to 128 mm while notches on the top edge measure 180, 256 and 362 mm. Bottom notches located at 100, 200 and 300 mm provide additional measurements. Made from 2 mm anodized aluminum, the lightweight, durable sieve measures 8-1/2” x 15”. Easily used by one person, the surface can be written on with pencil and later erased.