Docooler Turbo Boost / Vacuum Gauge Meter for Auto Car 2" 52mm 0~30in.Hg / 0~20PSI Orange Light With Single Gauge Meter Pod Holder High sensitivity and easy operation. Measurement range is 0~30in.Hg / 0~20PSI. Numbers and pointer clearly show the pressure. Used to measure the pressure of automobile turbo. Blue light on the dial for easy reading in the darkness.