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=== Microporous polyethylene tubes (MPT) ===
Microporous polyethylene tubes (MPT) attempt to mitigate the flow-dependency of other kinetic passive samplers such as Chemcatcher and POCIS by introducing a thicker membrane <ref>{{Cite journal|last=Fauvelle|first=Vincent|last2=Kaserzon|first2=Sarit L.|last3=Montero|first3=Natalia|last4=Lissalde|first4=Sophie|last5=Allan|first5=Ian J.|last6=Mills|first6=Graham|last7=Mazzella|first7=Nicolas|last8=Mueller|first8=Jochen F.|last9=Booij|first9=Kees|date=2017-03-07|title=Dealing with Flow Effects on the Uptake of Polar Compounds by Passive Samplers|url=https://doi.org/10.1021/acs.est.7b00558|journal=Environmental Science & Technology|volume=51|issue=5|pages=2536–2537|doi=10.1021/acs.est.7b00558|issn=0013-936X}}</ref>. The diffusive polyethylene layer prevents the thickness of the water-boundary layer (which is affected by flow) from dominating diffusion<ref name=":0">{{Cite journal|last=Fauvelle|first=Vincent|last2=Montero|first2=Natalia|last3=Mueller|first3=Jochen F.|last4=Banks|first4=Andrew|last5=Mazzella|first5=Nicolas|last6=Kaserzon|first6=Sarit L.|date=2017|title=Glyphosate and AMPA passive sampling in freshwater using a microporous polyethylene diffusion sampler|url=https://pubmed.ncbi.nlm.nih.gov/28886558/|journal=Chemosphere|volume=188|pages=241–248|doi=10.1016/j.chemosphere.2017.08.013|issn=1879-1298|pmid=28886558}}</ref>. The tube is filled with sorbents depending on the chemicals or chemical groups being sampled and has been successfully used to sample glyphosate, AMPA
===Peepers===
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