Fast sampling speed, digital display sampling rate: 2~3 times/second LCD display, 40-segment analog stripe LCD display with backlight Data hold, press the HOLD key to select the data hold function, press again to exit this function, the photometer will resume normal operation The compact design is more convenient, please cover the upper cover of the photometric sensor at the end of the measurement Maximum/minimum value, press the MAX/MIN key to select the maximum/minimum value reading function