Pro Tachometer is very accurate optical tachometer to read out the RPM of helicopter rotor blades(two Blades)

Specifications :

• RPM range :800 to 6500 RPM (5rpm by a click)
• Inboard battery : 4.8V, 800mAh NiMH
• Dimension : 59 x 150 x 28mm
• Weight : 150g

Source : Much More

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