Does exactly as its supposed to do. I added a couple ounces more weight to the pointer just to make it more accurate I feel.

Good price and prompt service! Thank you!

Nice tool. It is however somewhat difficult to rotate the scale resetting it to zero. One needs to loose the central screw but not too much so that the disc does not start to rotate by itself.

These timing indicators are adequate for the job, but a bit pricey for what they are and how they are made.

Originally ordered an E25 indicator but it was out of stock, so I ordered this higher priced timing indicator instead. It turned out to be a very poor design and obviously lacked quality control. The calibrated face was fastened so tight it would not rotate. The pointer and pendulum are plastic and do not have enough weight to get consistent readings. The threads on the piston stop were cut poorly and would not screw freely or fully into the spark plug hole. There was one flimsy rubber band supplied with the unit. The are not enough mounting tabs to hold it onto a 3 blade prop spinner. Had to pay $15 postage to return the item for a refund. A big and costly disappointment!