Yep the crank sensor is an optical style instead of magnetic like older engines were. It reads a light signal which has deviation across the RPM range than magnetic sensor's do. PRV= peak reading volt meter. You need one to properly diagnose a magneto as they produce large power spikes and you want to read the highest part of the peak.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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