This In-Line Voltage and Current Meter can measure real time voltage (up to 30V) and current  (up to 30A) of yours R/C components. 

Specifications

1. Input voltage: 5V-30V

2. Maximum working current: 30A

3. Voltage precision range: ±0.1V

4. Current precision range: ±0.1 A 

Operation instructions

1. Display the voltage and current in turn, show "U" means the next data is voltage & "A" means the next data is current.