ImmersionRC RF Power Meter V2 - Do You Need One or Not, Review and Tutorial. A very handy RC tool for checking power of video and RC radio transmitters. This video https://youtu.be/F9MgygZDrhk is a RF power meter v2 tutorial as well. Buy it here https://www.banggood.com/ImmersionRC-RF-Power-Meter-v2-w-Integrated-8-hour-Battery-for-RC-Drone-p-1271734.html?p=@C2213119324201301YF (if you need one). This fpv power meter will be a good addition to your drone racing tool kit. It's a handy measurement tool not only for drone racing but as a RC radio and FPV rf power meter in general. You can check the power level and duty cycle of your RC radio to see how many channels your radio is sending out including LRS transmitters. You can also check the performance for various antennas. Price: 79 USD Introductory Price Power Level: -20dBm up to +30dBm Calibrated Frequencies: 35, 72, 433, 868, 915, 1200, 2400, 5600-6000MHz in 50MHz steps Accuracy: +/- 0.5dB Attenuator: 30dB (Internal) Battery: 3.7V Lithium Ion cell, 10440 size, 600mAh Current Consumption: ~35mA Battery Life: ~8 hours Auto Shutdown: 5 minute timeout Charging: Micro USB cable Display: OLED, 128×64 pixels, monochrome User Input: Joystick Interfaces: USB, power control via CDC Antenna: 5.8GHz ‘Sniffer Antenna’ (linearly polarized ~2dBi dipole) Adapter: Male to Male SMA adapter Manual: https://docs.google.com/document/d/1MHtkZg81mqF2xibuO7tHb-OH-l9ib3NImpGnRQWFtBo/edit