Phase-shifting stroboscope contains dual-function delays in external mode. Delays adjustable as phase angle or time - resolution to 0.01° and 0.0001 seconds. An auto flash intensity maximizes brightness through entire range. The non-volatile memory stores and recalls three full settings & last measurement. Auto blanking allows use of standard optical sensors in most applications without flash re-triggering. It operates continuously from internal rechargeable batteries or line power.