The temperature and humidity of the constant temperature and humidity test chamber are important factors affecting the performance of the instrument, which can cause the corrosion of mechanical parts, reduce the smoothness of the metal mirror surface, and cause the error or performance degradation of the mechanical part of the high and low temperature tester; Such as gratings, mirrors, focusing mirrors, etc., the aluminum film is rusted, resulting in insufficient light energy, stray light, noise, etc., even the instrument stops working, thus affecting the service life of the equipment, and should be regularly corrected during maintenance. Dust and corrosive gases in the working environment can also affect the flexibility of the mechanical system, reduce the reliability of various limit switches, buttons, and optocouplers, and also cause one of the reasons why the aluminum film of the component must be rusted.
After a certain period of constant temperature and humidity test chamber, a certain amount of dust will accumulate inside. It is best to start the dust removal work by the maintenance engineer or the engineer under the guidance of the engineer to open the high and low temperature tester cover at the same time, and reheat the radiator of each heating element. Fasten, clean the sealing window of the optical box, calibrate it if necessary, clean the mechanical parts and necessary lubrication, and finally, restore the original shape, and then carry out some necessary testing, adjustment and recording. 
The ideal size for a small running bag is 30 liters, which is big enough to hold the ten essentials and extras for a personal climb. running bag can be as small as 10 liters or as large as 40 to 50 liters. If you are a frequent leader or carry a teammate (or a child), you may need a running backpack of 40 liters or more. In most cases, a travel backpack capacity of 30 liters is a standard capacity and the most popular choice. But if your activities range from hiking in summer to skiing in winter, you may need more than one shoulder backpacks. Consider your needs to determine your shoulder sling bags choice.
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