General Clinical Specimen Containers
Sigma Aldrich Fine Chemicals Biosciences Tamper evident sample tube
Self-standing non-sterile tube made of polypropylene. A tamper evident sample and transport tube design. They are ideal for all applications requiring a tamper evident seal in order to guarantee the utmost security and where sample integrity is of high importance. These unique transport tubes incorporate a seal that needs to be broken in order to open it which leaves an obvious visual indication that the vial has been opened. Manufactured from non-toxic polypropylene these tubes provide strength and clarity and exhibit some unique design features. five sizes are available from 5 to 30 mL. All graduated tubes are in 0.5 mL increments. They have external threads to provide a smooth and uniform inner surface.Caps should be ordered separately.
Electron Microscopy Sciences Silicon Test Specimen, Unmounted
This Test Specimen is made of a 5 mmx5 mm square of single crystal silicon. It is photo-etched and the squares repeat every 10 um. The dividing lines are 1.9 um wide.
A broader etching line is written every 500 um, which is useful in light microscopy. This is an excellent test specimen for comparing magnification and assessing any distortion in the image field. It is ideally useful in the context of automated counting systems to check for unsuspected distortions. Where critical measurements must be made the sample can be mounted directly onto the calibration specimen so that an internal calibration is obtained on the micro-graph.
