Large Size. Easy to use on the bike by getting between the spokes. Seems accurate enough. The only problem with the device is the scale. Each tick equals 5 psi of pressure and measures up to 160 psi. This is a compromise to be able to measure high pressure in some tires. I have three bikes, two of which draw about 90psi and one uses 48psi. I have the same brand lock on my car. This is a larger unit that can be scaled up to 60psi in 1psi increments. However, the size of the car block makes it very impractical for use on bicycles. Overall, I'm glad I have a smaller bike block. It works and I can tell it's just under 50psi on the scale so I know I'm getting the 48psi I'm looking for. I love the fact that it holds pressure until you press the trigger. This allows you to take a reading and then take the sensor and look closely at its scale to read it. Its small size and weight are a plus to take with you in your bike bag.
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