2. Instrument structure and working principle : the equipment for the pure mechanical structure of its tenets : will test equipment chassis plate inserted inside the claws after clamping locking : adjustment of the upper and overturned equipment rod axis so that compress pivot axis and test plate distance of about 0.5mm] forward overturned by the "reversed Parts "180 C (a pin position) 3. Use requirements : Unless otherwise specified in the pilot 23 ± 2 ° C temperature and 50 ± 5% relative humidity conditions, devices should be on the level (or fixed) instrument platform operators' sampling by GB3186-82 "coating product sampling "required by GB1727-79