I have three of these cool devices. The mower will have a Honda engine, a Troy-Bilt TB30 rear engine and one of my alternators. I have to buy another one. They are great as they have replaceable batteries. And they show revolutions per minute. If possible, avoid getting it wet. It's waterproof, but not as waterproof as sealed devices. There is a small O-ring in the battery compartment. Be careful not to fall out. There are two pins when inserting the battery, push the battery against it. You'll hold it if it's used correctly. This is the best price for you. Don't pay more! I'm using EverReady Energizer batteries instead of the regular 2450 batteries that came with it. You can conserve battery power by holding down the M and S buttons until a message appears on the display. The display will then turn off and the data will be saved. The display turns on automatically when the engine is started. Here are some photos. I will update this review and add more photos later.
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