The Dakota VX is a hand-held ultrasonic velocity gauge. When measuring materials such as casts, alloys, or plastics, the VX displays the speed of sound (velocity) through the material; thus giving an indication of its consistency.

With the hand-held VX Ultrasonic Velocity gauge, you can determine material velocities by measuring a known thickness, entering a known thickness into the VX, and the material velocity will be displayed. The tool’s backlit display is easy to read, even in dim light, and the unit operates for up to 200 hours on a single set of batteries.

The VX gauge has 2 measuring modes: The Point-to-Point mode, which is simply placing the probe to the material and the gauge will display the velocity at that point. The Scan mode allows the operator to place the probe on the material and then move the probe along the surface; when the probe is lifted from the material, it will then display the fastest velocity the gauge found on the area covered.

DAKOTA公司VX是一种手持式超声波声速测定仪(球化率仪)。当被测定的材料是铸件、合金或者塑料时，VX就会测出声波穿过它们时的速度。当VX发出的声波穿入一个已知厚度的被测材料后，速度就会被显示在屏幕上，因此，可得出所测材料内部组织是否紧密无缺陷。如可预先将球墨铸铁不同球化率百分比(通过金相法)试样做出，分别测量其不同的声速值，然后和实际工件的声速值进行比较，以此判断球化率情况。用于对铸件进行批量检查。

VX超声波速度计有两个测量模式，一个是点对点测量模式，在该模式下只需要简单地将探头接触被测材料表面，显示屏就会显示声波进入这个点的速度。而另一个模式，扫描模式，可以让使用者将探头接触被测物表面，然后沿着被测物表面游走，当探头从被测物表面拿开后，显示屏会显示游走区域的最快声波速度。