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British Wildlife

8 issues per year 84 pages per issue Subscription only

British Wildlife is the leading natural history magazine in the UK, providing essential reading for both enthusiast and professional naturalists and wildlife conservationists. Published eight times a year, British Wildlife bridges the gap between popular writing and scientific literature through a combination of long-form articles, regular columns and reports, book reviews and letters.

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Conservation Land Management

4 issues per year 44 pages per issue Subscription only

Conservation Land Management (CLM) is a quarterly magazine that is widely regarded as essential reading for all who are involved in land management for nature conservation, across the British Isles. CLM includes long-form articles, events listings, publication reviews, new product information and updates, reports of conferences and letters.

Subscriptions from £22 per year
Wildlife Survey & Monitoring  Aquatic Survey & Monitoring  Aquatic Survey Nets  Hess Sampler

Hess Sampler

Manufacturer: Manufactured by NHBS
Hess Sampler
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  • Hess Sampler Without Teeth In stock
  • Hess Sampler With Teeth In stock
Selected product: £182.50
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About this product

The Hess sampler is used in similar circumstances to a Surber Sampler but is even more accurate. The base of the Hess sampler is pushed into the substrate to make a seal. Two strong handles allow for forcibly pushing and rotating the cylinder into the stream bed. For use on harder substrates, the Hess Sampler is also available with teeth for cutting into the substrate, effectively converting the sampler into a cylindrical corer or stovepipe sampler.

The upstream side is sealed with a large upstream filter of preferred size to prevent any invertebrates entering the sampler through drift or when the external substrate is disturbed. The downstream side has a net bag fitted with a closed, screw on filter. Similar to a plankton net in shape, this bag will collect any invertebrates within the sample area. An expression of the number of invertebrates in relation to surface area sampled can then be calculated.

We have found the sampler robust enough to use in a tidal estuary where the upstream filter is severely tested. The upstream filter is affixed with velcro so is easily removable and washed for reuse.

The Hess Sampler is available to buy in individual components, allowing you to fully customise the sampler to your needs. By specifying both the upstream and downstream filters it is also possible to selectively sample the water column.

The Hess Sampler includes the metal pipe, nylon collar and jubilee clip for affixing the downstream filter and net. You will also need; 
* Upstream Filter (available in varying mesh sizes)
* Downstream Net and Filter (available in varying mesh sizes)



Hess Sampler:
* Available with or without teeth on bottom of sampler
* Tube diameter: 150mm
* Tube height: 400mm
* Material: aluminium alloy

Also includes:
* nylon collar which the upstream filter is affixed to
* jubilee clip for affixing the downstream net and filter

Upstream Filter (Sold Separately):
* 150 x 150mm
* Available in a variety of mesh sizes

Downstream Net and Filter (Sold Separately):
* Length: 400mm
* Available in a variety of mesh sizes


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