For internal timing and synchronizing of magnetos to the aircraft engines. Simply attach 3 clips to magnetos and adjust until both bright lights flash in synchrony and the buzzer changes pitch.
When I first attempted to use the unit it was dead. The batteries [4 each AA batteries] are located internally. There is no access to the batteries without breaking the Warranty Seals. I broke the seals and voided my warranty so I could use my unit. After re-seating the batteries, the unit worked as designed. The P-lead clips are a bit large and stiff. I had to use some smaller clip leads to attach to the Mag P lead nuts and then connect the smaller clip leads to the larger clips which are on the unit. I am going to replace the clip leads that go to the mags. I shall keep the large clip lead for ground. The price is a bargain.
When the package ( magneto buzz box)arrived it was audibly buzzing. I guess in shipment the switch was activated. I guess it had been buzzing for 2-3 days. I dont expect to get much more battery life out of it. The case of the timing device is taped shut. Is it difficult to change the battery? Does it take a regular battery?
Easy to use .
The dimensions are 6" x 3.5" x 2".
It uses a 9V alkaline battery.