numerical sequence the following new heading: 9902.17.37 Multifunction devices for calibrating electrical safety testers, each incorporating signal generator and multimeter, with a recording device (provided for in subheading 9030.84.00) Free No change No change On or before 12/31/2020 . 1616. Local area network extensions for instrumentation (LXI) data acquisition and switch units Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.38 Local area network (LAN) eXtensions for Instrumentation (LXI) data acquisition/switch units, each having both a universal serial bus (USB) and LAN terminal using the LXI standard, having a 3-slot mainframe in rear for plug-in modules, capable of measuring 11 different input signals and having a built-in digital multimeter (DMM) with 6-1/2 digits (22 bits) of resolution (provided for in subheading 9030.89.01). Free No change No change On or before 12/31/2020 . 1617. Oscilloscope calibration tools with five channels Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.39 Signal generators, certified by the importer to be used for calibrating oscilloscopes, the foregoing each with five channels and no recording device (provided for in subheading 9030.89.01) Free No change No change On or before 12/31/2020 . 1618. Signal generators Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.40 Signal generators, certified by the importer to be used for calibrating radio frequency measurement equipment, each presented without a recording device (provided for in subheading 9030.89.01) Free No change No change On or before 12/31/2020 . 1619. Oscilloscope calibration tools Subchapter II of chapter 99 is amended by inserting in numerical sequence the following new heading: 9902.17.41 Output-only signal generators, each with configurable phases and harmonics designed for calibrating power and energy equipment, the foregoing without