Nasco TTD Light Microscope

Product Number: SB52858

No longer avaliable

This item has been discontinued

Transmission-through-dye (TTD) is a technique developed at Kent State University that is complementary to bright-field microscopy. It works by adding a nontoxic blue dye to a sample and shining a red light on it at a wavelength that is strongly absorbed by the dye. Live cells exclude the dye and generate contrast in TTD images, with thicker cells or their parts appearing brighter. Broken cells and debris do not exclude the dye and remain dark, so it is easier to differentiate between living and dead matter. The TTD microscope also functions as a regular microscope, allowing you to switch between red and standard white illumination.

Replaceable Parts


  • Monocular with 45° incline eyepiece
  • Wide-field 10X eyepiece with pointer
  • 4X, 10X, and 40X objectives
  • Easy-to-use, floating stage
  • Coaxial coarse and fine focusing knobs
  • Cordless capability ideal for classroom or field use
  • Built-in cord storage
  • Bright and cool LED white light
  • 10-year limited warranty

Item Weight: 8
Color Group: White
Collections: STEM
STEAM: Environmental & Life Sciences
Subject Areas: Science Lab
Brand: Ken-A-Vision
Assembly Required: false
Color: White
Prop 65:


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