Upgraded version 150A power meter, software upgrade, 0.1A step high precision, high linearity, increased backlight function, more favorable price. Voltage detection function: It is very convenient to calculate the voltage, current, power, discharge capacity and discharge time of the aircraft, and it is convenient to calculate the force effect of the multi- aircraft. The unit of force efficiency is G/W (grams/watt). The calculation method is: the take-off weight divided by the current. The efficiency of the display is 2800G. When viewing the power in the hovering state after takeoff, the display is 230W. Then the force efficiency of this aircraft is 2800g/ 230w=1.21g/w. It is more suitable for the measurement of small current, such as: solar energy, electric vehicle measurement, etc. Due to different batches, there may be differences in the appearance, color, and printing of the product, which not affect its use. Colour:Black Material:Plastic Package Contents: 2 x Watt Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.