The test items are high temperature, low temperature, constant and alternating tests. This product is made to national standard, military standard and other relevant technical conditions. Mainly for aerospace, aviation, petroleum, chemical, military, automobile, ships, electronics, communication and other scientific research and production units to provide temperature change environment, lowtemperature storage, low temperature load, high temperature storage, high temperature load, constant, temperature cycle, high temperature working durability, five detection, wake up test, temperature ladder change project, test to the machine (or parts), electrical appliances, instruments, materials, etc. For temperature test, test product adaptability or evaluate thebehavior of the test product.