Rubber policeman

A rubber policeman is a hand-held flexible natural-rubber scraper attached to a glass rod used in chemical laboratories to transfer residues of precipitate or solid on glass surfaces when performing gravimetric analysis. Rubber policemen also come in one-piece flexible plastic versions. They are not the same as rubber scrapers.

Rubber policemen are also used in biological labs, to transfer tissue culture cells from a plate to a suspension. This technique is used in immunoprecipitation.