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.
Professional well made product. Just used it on my Bonanza doing an owner assisted annual.
quick and well
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 .
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.
Also not happy about the 4 AA batteries that you are not allowed to replace because you will void the warranty. I purchased last February but never used it at the time. After 8 months in the hangar I went to use this and I could see white corrosion along the seams. There is no external battery access. In order to inspect the batteries you have to unscrew the main casing where the circuit board is located. So, I decided to open it up (and void the warranty) to discover all 4 batteries had corroded so badly they dripped corrosion all over the circuit board and inner casing, as well as the battery compartment. I think Ive got it working again after using a toothbrush and white vinegar. However the idea of not allowing the user to check the AA batteries and replace if corroded/burnt out is absurd. This is not an ELT or aircraft avionic where someone is going to get hurt. Every other electronic device on the planet lets you check/change the batteries via an external access (so you dont take a chance on damaging the electronics). The fact they dont have this on this unit is just wrong. If the batteries go bad, which they will, you must attempt to send this back to the manufacturer for repair. Except, except.....they do not provide any name/address/contact means to do this! I would never have bought this device if I understood this built-in obsolescence. This is clearly not an aircraft quality device but a cheap Taiwanese knock-off.
Like the other reviews, mine arrived with the switch in the ON position and of course dead batteries. 4 new AA batteries and it works great. Would be 5 stars except the On/Off switch issue.
Mine also arrived with the buzzer buzzing. Batteries were almost completely dead. After replacing batteries, unit does not seem to function. Installing a certified rebuilt magneto. Magnetos were timed before replacement with another magneto timing device, so I know the left mag is properly timed. Still nothing except constant (really annoying) buzzing. Not light, no change of tone. Ordered magneto P-lead terminal to see if it will work with those. If not, Im returning it. Spent way too much time screwing around with this damn thing
The dimensions are 6" x 3.5" x 2".
It uses a 9V alkaline battery.
This timing light uses 4 AA batteries.
Made in Taiwan.