Turnigy 7in1 Mega Watt Meter and Servo Tester – Review

As I am building my DIY motor thrust measuring station, I was looking for a decent yet simple watt meter. This is an essential tool if you as you progress in the RC hobby. Check out my post about tools and equipment for multirotor.

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I came across this Turnigy 7in1 Mega Meter from Hobbyking, that is able to do a lot of useful things all by this compact device. I was sold by the specification, and the affordable price. For $40 you get the following features:

• Battery Cell/Voltage Checker
• Battery Internal Resistance Checker (check Lipo battery health)
• Watt Meter (Amps/Watts/Volts)
• Servo Tester
• Optical Tacho (give you motor/propeller RPM figure, used in Thrust calculator)
• Temp Gauge
• Thrust Calculator
• Battery Internal Resistance Meter

First impression is the quality is actually not bad. There is a temperature probe, input/output wires and a cable for checking lipo internal resistance provided. You need to solder your own connectors to the wires.

However there are a few drawbacks about this unit.

• It can’t run servo tester and watt meter at same time, if you want to test your motors with watt meter, you will need an external servo tester to control the ESC.
• The servo tester doesn’t have centre servo option, it’s got a knob, but it takes some effort to turn it exactly 1500us.
• Quite a few people complained on the product page that their unit has a faulty voltage reading, in the watt meter page. However mine seems fine, maybe a quality control issue.

Here is the manual for my future reference.

Here are the spec.

• Dimensions: 95.3mm x 72.8mm x 21.5mm
• Weight: 85g
• LCD Screen Size: 52mm x 30mm
• Max Input Voltage: 60v
• Voltage Display Resolution: 0.001v
• Max Current: 100A
• Shunt Resistance: 0.001ohm
• Displayed Resolution A: 0.01
• Temperature Resolution: 1 Celsius / 1 Farenheit
• PPM Signal Output: 750uS ~ 2150uS
• Prop Blade Measuring Range: 1~5
• Prop RPM Range: 1~60,000 RPM
• Includes:
  • Instructions
  • Power Leads
  • Temp Sensor Lead