How to use:
01. Turn off your amp.
02. Remove tube
03. Insert probe
04. Insert black banana plug in the COM jack of your multimeter
05. Insert red banana plug in the mA jack of your multimeter
06. Insert tube in the socket of the probe
07. Set your multimeter to the mA range (most common is 200mA)
08. Turn on your amp
09. Allow tube to warm up
10. You will get a direct reading in mA
11. Repeat in reverse
12. all done

Packing List:
1 * cathode current probe (assembled for use)
Universal Compatibility: Designed to test cathode current in a wide range of vacuum tubes including EL34, KT88, 6L6, 6V6, 5881, 6550, KT66, KT100, KT120, and 7027 (CT1-P), ensuring precise measurements for various amplifier setups.
Easy-to-Use Interface: Featuring a straightforward procedure, simply insert the probe, connect the multimeter, and obtain accurate readings in milliamps. No complex setup required, making it user-friendly for technicians and hobbyists alike.
High-Quality Construction: Crafted with a durable copper body for superior conductivity and a ceramic socket with gold pins for reliable and long-lasting performance. The 23cm tube socket cable provides flexibility during testing.
Direct Reading in mA: Get a clear, direct reading of the bias current in milliamps with your multimeter set to the mA range, allowing for quick and efficient testing without the need for conversions or calculations.
Comprehensive Package & Customer Support: Each purchase includes a fully assembled cathode current probe ready for immediate use.