Basically this is the only way you can get a decent SMD reflow oven at this price range. But you MUST follow the many online videos and blogs about how to upgrade it for safety and accuracy. Specifically:1 - Fix earth wire contact and add earth cable link to top part of case.2 - Replace "stinky" white masking tape around the oven base with Kapton tape.3 - Solder a "cold junction" thermistor to the motherboard to fix temperature sensor accuracy (critical for consistent reflows!).4 - Replace the fan with a quiet version (original is VERY noisy) and solder PWM cable to free GPIO pin on board so it can be intelligently controlled (switched off when not needed).5 - Load the upgraded firmware (Unified Engineering or SmashCat) to enable the enhanced cold junction, fan control and other features. You should consider soldering jumper pins or cables to the motherboard to make this easier.6 - Optional - Connect an ESP WiFi board to the firmware update and reset pins so you can fully control and monitor the oven remotely.In short... Without any upgrades the oven is not only bad but dangerous!!! BUT with the upgrades which are easy for anyone working with SMD devices to achieve, it is a fantastic little oven for prototypes or small batches of electronics production.
Harmand Kiefer 
