Reddit mentions of ScanTool OBDLink SX USB: Professional Grade OBD-II Automotive Scan Tool for Windows – DIY Car and Truck Data and Diagnostics

Id start with something line this starter set, a 3/8 breaker bar, 1/2 breaker bar, a Decent torque wrench, a plier set, vice grips, channel locks, adjustable wrench, screw driver set, a multimeter, decent scan tool, a jack, a funnell some drain pans from walmart, pb blaster, jack stands and make some wheel chocks. I'm sure I'm missing something pertinent, but remember you can rent some tools at your local parts store for free with a deposit so check to see what they rent before you buy. Also buy the remainder of the tools as you need them, its tough buying a lot of tools at once especially once you develop an affinity for some quality tools. A lot of the youtube guys have videos on what they use they most, but what I've listed should cover most maintenance tasks for your car.

> The maestro is only reading what the vehicle is providing so the speed and accuracy is limited by the vehicle manufacturer.

That's bullshit. :/

With something like this you'll see it's a big difference in PIDs/second. Just about any recent car will give you well over 100 PIDs/second. Meanwhile cheapo versions or wireless versions will limit you to 20, or even 10. It's not on the manufacturers, their own equipment has to read this data, if it's not accurate and fast it's either an older car (anything pre-05, most pre-08) or the scanner software/hardware is garbage.

id say go for the lower miles. get a car fax. get under it for awhile (when i buy used im under the truck for an hour or two) just looking. leaks, cracks, rust whatever. bring a flash light and an inspection mirror. i now bring a bore scope. push it down into the frame. cheap on amazon. hooks up to your smart phone.
https://www.amazon.com/Depstech-Semi-rigid-Inspection-Waterproof-Adjustable/dp/B00STB0EW6/ref=sr_1_2?ie=UTF8&qid=1499134773&sr=8-2&keywords=borescope
power washing can hide alot. cant hide mud and muck in side a box frame, pull wheels off and look at the brakes.
get a cheap obd II scan tool, pc one is what i have. plug it in, read what it says.
https://www.amazon.com/ScanTool-425801-OBDLink-USB-Professional/dp/B005ZWM0R4/ref=sr_1_25?ie=UTF8&qid=1499134641&sr=8-25&keywords=obd+2

Get this cable for $29.99

Get this FREE software called ForScan and install it to a laptop.

It will do everything you need it to. Ford Specific tests as well as ABS, BODY, AIRBAG modules can be read and even programmed.

I bought this one and have been very happy. You will need a laptop to use it. It will do all the basic error code checks, but also has the ability to log sensor data, which is nice when you're trying troubleshoot.

https://www.amazon.com/dp/B005ZWM0R4/ref=cm_sw_r_cp_api_Fq5GAbV5ZBNZV

a few basic things, spark plugs, fuel filter, or a sensor.

take it a a discount autopart or somehting similar, or even better buy one of these http://www.amazon.com/ScanTool-425801-Interface-Diagnostic-Software/dp/B005ZWM0R4/ref=sr_1_6?ie=UTF8&qid=1369345003&sr=8-6&keywords=usb+car+diagnostic and it will tell you if there is a bad sensor.

I have a standard usb OBD cable but not specialized for tuning. It comes with some gimped software, but has worked with better software previously. If you could use it, you'd be welcome to borrow it.

I bought one of these about 5 years ago and LOVE it.
It comes with free software to load on a laptop.
I've used it for everything from just clearing the CEL for friends to monitoring all data while driving (very cool dashboards with this software).
https://www.amazon.com/ScanTool-425801-OBDLink-USB-Professional/dp/B005ZWM0R4