"Unique patented thermal conductivity sensor automatically compensates for temperature","Replaceable, cleanable, plug-in sensor handles 450 psi positive pressure","Displays 7 different units of vacuum (microns, milliTorr, Torr, millimeters of mercury, millibar, kiloPascal and Pascal)","12\" coiled sensor cord stretches to 24\" for easy reach, connectivity and readability of display","Magnetized on back for secure, upright positioning on any magnetized surface","Low battery indicator","Automatic shut-off after 20 minutes","Calibration standards traceable to NIST DIGITAL VACUUM GAUGE AC9086 | Matco Tools