Attribute
1. Desktop spectrometer 1 unit

• Rotary dial, diameter not less than 150 millimeters, can be rotated and can be locked in position. At the top there is a platform for placing the prism and a frame for inserting grating plates. which can be rotated around and locked in position
• Parts of the collimator not less than 170 mm long, attached to the base Lens focal length Not less than 25 mm. with a dial to adjust the distance of the lens. and can adjust the width of the slit at a maximum of not less than 7 millimeters
• Camera, not less than 170 mm long, attached to the base. The barrel can be rotated around the base without friction. and can lock the position The focal length of the lens is not less than 25 mm and the magnification is not less than 8 times. There is a line indicating the position of the image on the eyepiece and there is a dial to adjust the sharpness of the image.
• There is a scale indicating the angle values ​​on 2 sides, resolution of 1 minute or more.
• There is a wooden box for packing.

2. high-voltage power supply

• Has a voltage of not less than 10,000 volts, able to light the low pressure spectrum lamps to be clearly bright.
• Use with electricity 220 volts, 50 hertz. It can work continuously for not less than 1 hour each time without overheating and damage.

3. A set of tubes containing at least 4 types of low pressure gas such as argon, helium, nitrogen, and the electrodes are fixed to the tubes. middle part of the stenosis tube - long to squeeze the beam dark at least 6 tubes
4. Grating sheet size not less than 16 mm. x 9 mm. with 100 lines/mm., 300 lines/mm. and 600 lines/mm. included in a plastic sheet of not less than 90 mm. x 40 mm.