Extech 461880 Information The Extech 461880 is a combination vibration meter and laser tachometer that measures acceleration, velocity, displacement, plus RPM with contact/non-contact and linear surface speed. It features a remote vibration sensor with magnetic adapter on a 39" (1m) cable, a wide frequency range of 10Hz to 1kHz, RMS and Peak Value measurement modes, and manual/auto store/recall up to 1000 readings. The data hold function freezes the reading in the display, and the auto shut-off saves battery life. The laser tachometer uses a laser for greater distance non-contact measurements up to 4.9ft (1.5m) and stores last, max, and min readings. The Extech 461880 comes complete with remote vibration sensor, magnetic mount, wheels for linear surface speed or RPM (cone tip and flat tip), reflective tape, 4 AA batteries, software with cable, and hard carrying case.