Utilizes Hall effect sensor with ATC (Automatic Temperature Compensation) Adjustable data sampling rate: 1 to 3600 seconds Memory stores 99 readings manually Datalogging feature records readings with date and time stamp on an SD card (included) in Excel" format N pole/S pole indicator Zero button for DC measurement Data Hold and Min/Max Auto power off with disable Specifications Weight 10.7oz (303g) Dimensions 7.1x2.9x1.9in (182x73x48mm) Datalogging Datalog readings on SD card (included) DC milli Tesla 300.00mT to 3000.0mT DCgauss 3000.0G to 30,000G AC milli Tesla 150.00mT to 1500.0mT ACgauss 1500.0G to 15,000G AC Bandwidth 50Hz/60Hz Sampling Rate 1 to 3600 seconds