INDEX IMPORTANT NOTES MAINTENANCE CONSTRUCTION MICROSCOPE USAGE MODEL AY11240/AY11238 Maintenance............................................ Model AY11240/Model AY11238.................. Model AY11228/Model AY11232.................. Model AY11230/Model AY11234.................. Model AY11236........................................ Warranty Information................................ 1 2-5 6-9 10-13 14-18 Back Cover Congratulations on your purchase of this high quality BARSKA  microscope. With proper care, this microscope will provide many  years of use. Please read the following instructions before  operating this instrument. 1. Do not attempt to disassemble the instrument. This product has been carefully assembled at the factory and should only be examined by a factory-trained technician. 2. This instrument should only be used in an environment with an indoor temperature range of 32$^{o}$F to 104$^{o}$F. 3. Do not use this instrument in an environment with a lot of dust. Cover the instrument when not in use. 4. Do not subject the instrument to shock. 1. Keep the instrument in a dry and moisture-free location. 2. Do not expose to acid, alkali fumes or moisture. 3. Keep optical parts clean and free of dust. To clean optical parts gently wipe with lens cleaning tissue and a mixture of alcohol and diethyl ether. Depending on weather conditions, the following are the recommended mixture ratios: 4. After use, cover the instrument with the plastic dust cover. 5. If instrument is to be stored for an extended period of time, remove the eyepiece and oculars and store in a moisture-proof container. BARSKA Model AY11240 is a fixed tube type. For comfortable  observation, the arm can be easily tilted at any angle from 90 o  vertical to 45$^{o }$level. It is also equipped with a coarse adjustment  and fine adjustment as well as a space limiter to protect the  objective from contacting and damaging the specimen. BARSKA  Model AY11238 features a monocular tube that is slanted at a 45$^{o}$  angle. The head rotates 360$^{o}$. The Eyepiece Set Screw prevents  the eyepiece from falling out of the tube. BARSKA Model AY11240 and Model AY11238 are designed for  biological studies such as specimen examination. They can also be used for examining bacteria and for general clinical and medical  studies. Simple design and use is especially useful for school  classroom instruction. Coarse  Adjustment Knob Fine  Adjustment Knob Stand 5-Hole Diaphragm and Condenser Concave Mirror Stage Spring Clips Objectives Barrel Revolving Turret Eyepiece Coarse  Adjustment Knob Fine  Adjustment Knob Stand 5-Hole Diaphragm and Condenser Lamp  On/Off Switch Lamp  Power Cord Stage Spring  Clips Objectives Rotating Head Revolving  Turret Eyepiece Stage Height Limit Adjustment Monocular Tube Eyepiece  Set Screw Model AY11240 Model AY11238 2 1 Proper care and storage of this instrument is essential. Please read  the following guidelines: Wet weather: 1:2 Dry Weather: 1:1