Bosch's FIX 7529 Digital Timing Light features microprocessor-controlled circuitry and is loaded with advanced features including a bright LED display, mode indicator lights, and flashlight. The ideal timing light for the heavy do-it-yourselfer or professional technician. Use to measure engine RPM and advance, and set initial timing, check and measure centrifugal advance, and measure vacuum advance. Works on gasoline powered vehicles equipped with conventional, electronic, computer controlled, DIS, or 2-cycle ignition systems. Digital LED tachometer display reads 0-9999 RPM. Advance display indicates to 1/10. Handy 2/4 cycle and RPM/advance mode lights help you keep track of settings and multi-task. RPM/advance selector button and up/down buttons that increment or reduce the advance make operation simple and easy. Features a super bright Xenon flash that makes it easy to see timing marks - even in daylight. The all-metal inductive pickup and durable ABS housing offer rugged reliability while heat resistant over molding on battery clips prevents burned fingers. Works on 6V and 12V vehicles (6V use requires a separate 12V automotive battery for power). Includes comprehensive instruction booklet in English, Spanish, and French. 1 year warranty.