For fast convenient and safe collection of liquid samples Add 500 and 1000 mL bottles with our snapper attachments Adjustable from 4 - 6.5 Collect all the sludge you need to sample at a safe convenient distance. You ll have no problem transporting or reaching your source since the unit adjusts in length. Ideally suited for numerous liquid sampling requirements including chlorine in solution, BOD or suspended solids, this device extends from 4 to 6.5 Sample bottles are held in position by a plastic snapper ring that has an adjustable locking device.