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This traditional distillation unit produces from 300 - 400 ml per hour from a 1000 ml flask. This water has been shown to have a conductivity of 7 x 10^-7 Mhos, and to be essentially free from biological contamination. Hardware, heating mantle and powerstat included.

Composed of three magnification specimens attached firmly to a scanning microscope specimen mount. One specimen is 400 mesh copper screening for low magnification work. The middle specimen is a 15,240 line per inch grating for the high magnification range. The third specimen is a 1,500 mesh nickel screening for the middle magnification range. 50 mesh screening is placed over entire grating for strength. This composite specimen is both a time and space saver. Measurement charts and instructions for use included.

Please specify the type of specimen mount required.

Replica specifically made for SEM use is taken from a ruled diffraction grating with two sets of lines ruled at right angles to each other. There are 54,864 lines per inch in both directions. A 50 mesh screen is placed over entire grating for strength. Useful for magnification determination, detection and measurement of lens distortion, and the determination of the degree of fore-shortening in an image, as a function of specimen tilt. Measurement chart and instructions included.

Please specify the type of specimen mount required.

3" diameter top plate. Cabinet dimensions 7 1/4" x 5 1/2" x 4 3/4". Power requirements 50 watts. This unit uses the most efficient solid state thermoelectric modules yet developed. DC power is supplied to these high powered modules to control temperatures between +25^o C and -20^o C depending on the set point required. All units may use air cooling with built-in fan, or tap water cooling as the heat exchanger. Equilibrium is reached in 2-3 minutes. Lightweight, portable. Has been used successfully in recrystallizations, freezing point determinations, and temperature control for physical measurements.