The Fluke T + PRO is the ideal, full-featured tester for the demanding commercial and industrial electrician. The Fluke T + is the basic electrical tester for residential electricians and HVAC technicians. These testers include all of the advantages of a traditional solenoid tester, with added functionality, but none of the typical drawbacks. With voltage measurement, continuity, built-in flashlights, GFCI trip capability, and Fluke's legendary ruggedness and reliability, the tester is an excellent choice for most residential, commercial, and industrial applications.