| 摘要 |
<p>The invention concerns a metering device (10) which can, in one application, be used to prepare accurate aqueous concentrations of agrochemicals such as pesticides or herbicides. The device has a transparent, hollow barrel (12) with a central axis, a front end (16) including a conduit connection point and an open rear end (18). There is also a plunger (28) which is visible in the barrel and movable axially in the barrel and which has a closed front end (30) carrying a seal (33) which makes sliding, sealing engagement with the barrel, a hand-engagable open rear end (37) and an internal storage space (35) extending to the open rear end. A withdrawal/delivery conduit (44) is connectable to the front end of the barrel so as to project forwardly from the barrel. This conduit can be stored in the storage space in the plunger when it is not in use. There is a closure (42) for closing the rear end of the plunger thereby to close the storage space.</p> |
