The big difference is that the AIRFORCE® MK4 Truck Tyre Inflator is capable of inflating up to 174 psi (12 bar), a substantial hike from the already impressive 138 psi (9.6 bar). The AIRFORCE® MK4 Truck Tyre Inflator is a gauge which not only answers the market need for a higher pressure inflator but also provides one which can withstand harsh tyre shop environments. The new AIRFORCE® MK4 Truck Tyre Inflator is set to become the heavy duty solution for providing safe, cost-effective and trouble-free high pressure inflation with guaranteed accuracy. This in turn will give truck tyre users the benefits of extended tyre life, increased fuel economy and improved safety. The reliable and versatile AIRFORCE® MK4 Truck Tyre Inflator, with its aluminium die cast body and linear gauge represents the best product on the market for both indoor and outdoor applications, even in extreme weather. Features & Benefits New Viewing Window - Larger window gives 20% greater field of viewing Lighter Weight - Gauge body weighs 923g, less work strain and easier for repetitive use Biomorphic Shape - Ergonomic, easier to use and less prone to damage when dropped New Valve Mechanism - Simplified 2 stage mechanism design prevents user having to "push" against full line pressure on deflate preventing fatigue New Piston & Seal Design - New design, less drag, reduced friction & less movement inertia means no internal corrosion, no sticking and no skewing of accuracy Accuracy Standards - Tested to over 400,000 cycles at 100% accuracy, meets EC 86/217 and compliant with EN12645:2014 Specifications Material: Die Cast Aluminium Body AccuracyMeets EC 86/217 Compliant with EN12645:2014 Reading Intended Accuracy up to 4bar: +/-0.08 bar Reading Intended Accuracy 4 to 10bar: +/-0.16 bar Reading Intended Accuracy 10bar and above: +/-0.25 bar Uncertainty Of Measurement: +/-0.025bar Minimum Inlet Pressure: 5.5 bar / 79psi Maximum Inlet Pressure: 15 bar / 217 psi Inflation Flow: 500 l/min / 13 cfm Hose Length: 3.6M - 141" Tyre Valve Connector: Twin Hold-on Air Inlet: 1/4" BSP Genuine PCL: AFG5H36 Comes with certificate of calibration Can both inflate and deflate