My HS 36 lied like a dog using HZ to set the frequency for a 16KW standby generator. Caused me to jack the voltage alll over the place and had to call the shop. Our truck Mechanic came out with his Fluke and ribbed me into the ground about having to bail out a 30 yr career old f**t! Took another hr to dial back in the right HZ & volts and move on. Now I'm suppose to use the fp again? "When pigs fly"!