Alpha samplers are suitable for use in oceans, deep lakes, and corrosive waters (do not use when mercury concentrations exceed 1 ppm). Vertical samplers retrieve large water samples at any depth and collect plankton or floating sediments. Urethane end seals snap shut with minimum surface disturbance on messenger contact. Drain valve provides easy sample removal. Samplers include a carrying case; order messenger and line separately under. Silicone end seals are available by special order; call our Application Specialists for details.