• Dual test circuits
  Versatile, can test footwear or wrist straps per ESD TR53
• Positive rocker switch actuation
  Reliably changes test mode
• Redesigned test button
  Rugged and reliable operation
• LED's display test results
  Simple operation with clear test results
• Red light and audible alarm
  Indicates that circuit resistance is too high or too low
• Battery powered with low-battery indicator
  Provides early warning to replace battery
• Optional AC adapter
  Versatile - can use line AC if preferred
• Upgraded footplate
  Molded bottom insulates and isolates wider, sturdier surface test area
• Provided with calibration to NIST traceable standards; calibration unit available for users to maintain NIST calibration at their facility
  Simple means to assure accurate performance Lower calibration life cycle costs
• To see Desco Combo Tester 19250, click here
• Made in America

“Compliance verification should be performed prior to each use (daily, shift change, etc.). The accumulation of insulative materials may increase the foot grounder system resistance. If foot grounders are worn outside the ESD protected area testing for functionality before reentry to the ESD protected area should be considered.” (ESD SP9.2 APPENDIX B - Foot Grounder Usage Guidance)

“A log should be maintained which verifies that personnel have tested their personal grounding devices.” (ANSI/ESD S20.20 Paragraph 6.2.2.2 Personnel Grounding Guidance)

“Frequency of Functional Testing: The wrist strap system should be tested daily to ensure proper electrical value. Nominally, the upper resistance reading should be < or = 10 megohms or a user-defined value.” (ANSI/ESD S1.1-2006 Annex A3)

Per ESD SP9.2 APPENDIX C - Parallel Ground Paths, “A parallel ground path allows a flow of electrical current through a path that is not intended for the test. Parallel ground paths may be caused by several different situations. For example:

a. The path represented by the person standing with one shoe on the floor and the other shoe on the test apparatus. A parallel path may be created by the shoe on the floor. Current from the test instrument is then directed down two paths when it was intended to be directed down one. The correct path for the test is with one shoe in the air or on an insulating surface and the other shoe on the test plate.

b. The path presented by a person inadvertently supporting themselves by means of one hand on another object such as a wall, table or supporting member in order to measure the resistance in one foot contact. The hand has created a parallel path to ground.

c. The path represented by a person leaning against another object with other parts of the body in order to provide physical support during a testing sequence. This can then lead to other grounding paths and erroneous results.”