Electronic Specialties 303B Fuse Buddy Digital Multimeter Adapter, 0-20 Amp, for ATO Fuse Digital Multimeters

Electronic Specialties 303B Fuse Buddy Digital Multimeter Adapter, 0-20 Amp, for ATO Fuse Digital Multimeters

• The Electronic Specialties 303B Fuse Buddy Digital Multimeter Adapter is a safe and efficient solution for measuring circuit current directly through ATO fuse sockets. Designed to work with digital multimeters and oscilloscopes, this innovative adapter replaces the fuse during testing while maintaining circuit protection. Ideal for automotive, marine, and low-voltage electrical diagnostics, the Fuse Buddy simplifies current testing up to 20 Amps and 48 Volts without the hassle of unstable probes or bulky inline connections.
• Features
  • Measures Circuit Current up to 20 Amps – Enables accurate current testing for automotive and low-voltage electrical systems.
  • Fits ATO Fuse Sockets – Molded in the shape of a standard ATO fuse for quick and secure installation.
  • Maintains Fuse Protection During Testing – The original fuse is inserted into the Fuse Buddy, keeping the circuit protected throughout diagnostics.
  • Secure Connection Design – Stays firmly in the fuse socket without slipping out like conventional test probes.
  • Ideal for Parasitic Drain Testing – Helps diagnose hidden battery drains and excessive current draw.
  • Compatible with DMMs and Oscilloscopes – Displays readings directly on a digital multimeter or scope for detailed analysis.
  • Wide Application Range – Suitable for automotive, marine, RV, and household circuits up to 48 Volts.
• Benefits
  • Effortless Connection – Inserts directly into the fuse socket for quick setup and stable testing.
  • Enhanced Safety – Preserves factory fuse protection unlike direct probe testing methods.
  • Universal Diagnostic Capability – Useful for diagnosing electrical faults, current draw, and parasitic drains.
  • Reliable Current Measurement – Eliminates accidental disconnects during testing.
• Specifications
  • Manufacturer: Electronic Specialties
  • Part Number: 303B
  • Order Part Number: ES303B
  • Product Type: Fuse Buddy Digital Multimeter Adapter
  • Fuse Type Compatibility: ATO Fuse
  • Measurement Range: 0 to 20 Amp
  • Voltage Capacity: Up to 48 Volt
  • Application: Current Measurement and Electrical Diagnostics
  • Compatible Equipment: Digital Multimeter (DMM), Oscilloscope
  • Country of Origin: China
  • Harmonization Code: 90309088
  • Default Selling Unit: EA
• Applications
  • Automotive electrical diagnostics
  • Parasitic battery drain testing
  • Marine electrical troubleshooting
  • RV and trailer circuit testing
  • Low-voltage household appliance diagnostics
  • Fuse circuit current measurement
• How It Works
  • Remove the vehicle fuse from the fuse socket.
  • Insert the original fuse into the Fuse Buddy adapter.
  • Plug the Fuse Buddy into the fuse socket.
  • Connect your digital multimeter or oscilloscope to the adapter leads.
  • Read current measurements directly from the testing device while maintaining fuse protection.
• The Electronic Specialties 303B is also commonly referred to as a Fuse Buddy tester, ATO fuse current adapter, automotive current testing adapter, parasitic drain tester, fuse socket multimeter adapter, inline fuse current tester, and automotive amp draw tester.

Q: What type of fuse does the 303B work with?
A: The 303B is designed specifically for ATO-style fuse sockets.

Q: What is the maximum current capacity?
A: The Fuse Buddy adapter measures current up to 20 Amps and up to 48 Volts.

Q: Can this tool help diagnose parasitic battery drains?
A: Yes. The 303B is ideal for identifying parasitic current draws and hidden battery drains in automotive electrical systems.

Q: Does the Fuse Buddy maintain fuse protection during testing?
A: Yes. The original fuse is inserted into the adapter so the circuit remains protected while measurements are taken.