The PM1.0 Sensor is a sensor that detects ultra-fine dust 1.0 µm in diameter, which is 1/100 of a strand of hair, in real-time.*Tested by KCL [Sensor certification] Test Model: FS061PSSA, Test Date: 21.09.27~21.10.22, Test Method: SPS-KACA 002-0132 N24, Test Institution: KCL (Korea Conformity Laboratories), Test Method : SPS-C KACA 0027-7269:2018 Converted mass-number concentration performance test method of optical dust sensor, Test Result: In the measurement range, within the range of ±50% at the high concentration of the reference instrument, and within the range of ±15 ㎛/㎥ at the low concentration. Results may be different depending on the environment.