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Apparatus has been designed with safety. A single control knob on the front panel incorporates the mains ON / OFF switch with arbitrary scale of 0 to 10. This apparatus has been designed with safety. A single control  knob on the front panel incorporates the mains ON / OFF switch  with arbitrary scale of 0 to 10. A rapid heat switch allows higher  temperatures to be obtained quickly. Sample tubes are illuminated  from behind and magnified through a lens. A selector at the rear of  the instrument allows a light or dark background. Ceramic insulation  around the aluminium heating block minimizes heat transfer to the  casing.
