For a limited time we have the Kestrel 4250 Racing Meter combo. This is a great tool used by NASCAR and NHRA teams to gather track conditions such as temperature, humidity, altitude, as well as wind speed.  All of which can be linked to a computer using bluetooth. 

Even slight changes in air density, water grains, and density altitude can dramatically affect a machine’s performance. With the added ability to easily measure and track these and other critical factors, such as absolute pressure, temperature, humidity, wind speed and barometric pressure, the Kestrel 4250 Racing Weather Tracker arms racers with the accurate weather data needed to make those last minute jetting or tuning decisions.

The Kestrel 4250 measures relative humidity and calculates dew point, wet bulb temperature, heat stress index, and the humidity ratio—and the patented dual chamber humidity sensor assures fast and accurate readings in any environment.

The Kestrel 4250 has taken the calculations and guess-work out of air flow measurements with automatic air flow readings. Plus, it measures every other environmental parameter and stores over 2000 points worth of information in its built-in data logger. And with on-screen customization, the 4250 can truly be personalized for every technician.

If you want to tune quicker, keep track of timing, density, water grains, and your ET/MPH.  This will let you dial it in on fewer passes based on the data.