Patent ID: 8138936

Claim:
A device for testing personnel ESD grounding devices with a function of near-fail alert; the device having a tester; wherein a near-fail range is set in the tester; when the measurement of the resistance for a wrist strap or a footwear is within the near- fail range; an alarm is actuated to alert a user that the static electricity prevention devices worn by the user will fail soon; and wherein the near-fail range is set in the test pass range, but near a test fail limit; wherein the tester includes a plurality of LED alarm lights serve for displaying test results; wherein each set of LED alarm lights includes three lights of different colors for displaying various test results; wherein the lights includes a red light, a yellow light and a green light; wherein the yellow light shows that the value of resistance of the object under test is bigger than the upper limit; and the test is a fail; the red light shows that the value of resistance of the object under test is smaller than the lower limit; and the test is a fail; the green light shows that the value of resistance of the object under test is allowable; and the test is a pass; if both the green light and yellow light turn on simultaneously, it represents that the resistance of the object under test is within a permissible range but it is also near an upper limit, that is, the object under test is near-fail high; and if both the green light and red light turn on simultaneously, it represents that the resistance of the object under test is within a permissible range but it is also near a lower limit, that is, the object under test is near-fail low.