Ponar grab borrow borrow devices is * * Bonaventura Bonaventura grab borrow devices US Wildco company Ponar grab borrow devices Ponar? Clamshell dredging widely used in freshwater and seawater hard bottom Mud samples. The central axis self-closing grab design, small sediment disturbance. Borrow is durable, can be equipped with heavy weights, tapered edges conducive to sampling. Removable top sieve, sieve aperture 500μm. The dredging has two kinds of specifications: Standard Ponar sediment sampler, heavy equipment, large-volume sampling, requires the winch operation; small Ponar sediment sampler, Ponar lighter than the standard for more than half can be operated by hand???.