We have high and low temperature tests and normal temperature tests for each product, and perform specific performance tests when we come out of the factory. High temperature test: test in high temperature of 80 DEG C under the condition of the sensor can work at low temperature; low temperature test: Test: test case in -40 C sensor is normal (can be tested according to customer requirements), after high and low temperature test sensor internal components is mainly the weld, and sensor work in extreme temperature conditions when the distance is in the range of induction in technical requirements (-40-+80 C Sn:sn + 10%). Room temperature test: indoor temperature is 20 degrees Celsius to detect, check whether the induction distance meets the technical index; factory inspection: confirm that the product performance is in the range of technical indicators.