The 3-in one digital rpm/frequency/hour meter model prhf-03 is unique product especially deisgned for the manufactures and users of genrator sets. It`s design is stricly in accoradance with specife nees and requirments of dg set usets with high quality standards. The newly developed monitoring instrument is based on latest microcontroller technique, which gives better accurcy, digital measuting instruments, because of its this product has edge over other multifunctioning i e it can be used as rpm/frequency/hour meters : simultaneously using only one unit, benifts state-of-the-art : microcontroller technology, zero crossing time measurement to give finer accurcy, fastest sampling rate between successive mesurements 4-digit display to give a adequate resolutions operating range: 160-270 v a c: other operating viltage-110 v ac and 440 v ac available on demand auto ranging and life time memory retention/back up.