Standard ES is a version of the very popular Standard Water Sampler, similar with Niskin type. The internal power cord, which activates the closing mechanism is placed outside along the rigid PVC body, eliminating the risk of sample contamination.
Also, with this arrangement, the power cord can be easily inspected and replaced when becomes weak after a period of time. All the other characteristics of this type of sampler remain unaltered. The simplicity of this improved water sampler, easy to operate and very cost effective, makes it attractive.