We are offering tachometers. Product features: micro-controller based design with world class indian software.non-contact sensing through reflected light beam on reflective sticker.lcd displayinput sensing indication through led.memory facility to retain measured value.portable, lightweight, strong and elegant abs enclosure.accuracy: 1rpm up to 5, 000 rpm and 0.05% of the reading above 5, 000 rpm.resolution: 0.1rpm up to 5, 999 rpm and 1rpm at and above 6, 000rpm.calibration certificate provided along with tachometer - traceable to national and international standards.