Parker's ServiceJunior captures momentary pressure spikes that are "invisible" to liquid filled gauges. With its 10 msec scanning rate, the maximum pressure reading it delivers can be trusted as a much truer reflection of the systems actual condition; so you can identify potential problems better and diagnose their causes faster. All readings are acurate to within +/-0.5% full scale. Four menu buttons provide for easy operation. Minimum and maximum graphic display also shows pressure peak. Two 1.5V AA batteries power the large 4-digit backlit display. Power status is displayed continuously.