TACHOMETER The Monarch Instruments ACT-3X is a powerful, NIST calibrated, fully programmable tachometer and totalizer. It accepts inputs from all Monarch speed sensors or from any standard TTL generating device. The unit operates from 120/ 240V AC input power or from 12 or 24V DC input power ( optional) . Programming the Monarch ACT-3X is easily performed through the 5 front-panel push buttons or using the optional PM remote software. Set up for single channel monitoring or use the auxiliary second channel input Specifications Display     5 digit, 0.56” ( 14 mm) high red LED Ranges     5 to 999, 990 RPM Totalizer     0.001 to 99, 999 Accuracy     Standard gate: ± 0.001%  Fast gate: ± 0.01%  Resolution     Up to 0.001 RPM, 10 RPM ( 100, 000 to 999, 990 RPM)  Memory     Maximum, minimum and last Operating Temperature      14 to 122° F(  10 to 50° C)  Dimensions     1/ 8 DIN by 4.5” ( 114 mm) deep. Panel cutout: 3.58” x 1.74” ( 91 x 44mm)