Which Heavy duty diesel / universal diagnostic tool worth buying?

Top 8 Heavy duty diesel / universal diagnostic tools for sale:
http://www.chinacardiags.com/wholesale/heavy-duty-diagnostic-tool/

1.Cheap Nexiq USB Link 2 + Software Diesel Truck Interface and Software with All Installers With DHL Free Shipping

2.CAR FANS C800 Heavy Duty Diagnostic Scan Tool Truck Scanner for Commercial Vehicle, Passenger vehicle, Machinery with Special Function Calibration

3.XTUNER T1 Heavy Duty Trucks Auto Intelligent Diagnostic Tool Support WIFI (DHL Free Shipping)

4.Top Volvo 88890300 Vocom Interface for Volvo/Renault/UD/Mack Truck Diagnose Volvo Vocom

5.PS2 Truck Professional Diagnostic Tool Update Online supports English/Spanish

6.VXSCAN H90 J2534 Diesel Truck Diagnose Interface And Software With All Installers same like nexiq and nexiq 2 with DHL Free Shipping

7.Latest V2.31 Scania VCI-3 VCI3 Scanner Wifi Wireless Diagnostic Tool for Scania

8.V2.40 VCADS Pro Truck scanner for Volvo Truck Diagnostic Tool (USA Local Shipping)