■ Magnetic base
■ The display flips over when the bottom faces up
■ The backlight is on automatically when in use, and
automatically off in 30 seconds after use
■ Absolute horizontal reference can save in memory for ever
■ Button: ON/OFF/REF; DATA; %, °; HOLD
■ Built-in bluetooth, Max. transmission distance: 6m
■ Automatic power off in 3 minutes
■ With re-chargeable battery, for 5 hours working
