If you have a lot of time to measure the volume of the same liquid or granular materials, make the appropriate mark on the measuring circle, glued at the right level strips of adhesive medical tape. At the same time can be done on them and the labels which are specified died.
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Often you have to handle the fine details of any corrosive liquids, vapours which are harmful to the eyes, and have to work close low, which further increases the risk. Need goggles, but...
RC FOR ALL
High speed car with remote control and internal combustion engine for twelve year old boys? I will say, this is not serious? The creation of such machines is the "aerobatics"...
