Hot Socket Gap Indicator

The TESCO Hot Socket Gap Indicator (Catalog No. 300) is quick, easy-to-use and has a rugged, non-conductive insulated shell. The mechanical tool engages the jaws of a meter socket and will indicate a gap or significant loss of jaw pre-load. Total estimated time of testing four jaws is less than 30 seconds. Even minor gaps can result in electrical arcing, resulting with a more serious problem, failure, or electrical fire.

The TESCO Cat. 300 will work with all sockets, including meter socket jaws with designed-in gaps, and socket jaws which have fresh lubricant.

Note: If feasible, service should be disconnected. Regardless of whether the service has been disconnected or is live, personal protective equipment (PPE) should always be used while operating.




  • Easy-to-use design
  • Determines unsafe holding-force on meter socket jaws based on laboratory testing
  • Blade spring force was designed to effectively determine a minimum unsafe threshold
  • Insulated plastic body (Rated 3000 V)
  • Tin-plated spring steel blade used to withstand daily use, travel, and vibration
  • No maintenance required
  • Calibrated for 5 years or 1,000,000 sockets (whichever occurs first)

Equipment Documentation



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