We have made the difficult decision to discontinue production of the Series 1520 Thrust Stand. With the increased prices of everything from chips to raw materials, it simply no longer makes sense to keep selling the Series 1520, knowing that we have the similar but enhanced Series 1580 test stand available.
If you're looking for a small thrust stand, we recommend looking into the Series 1580 as an alternative. It is similar in many ways, but it measures torque and thrust whereas the Series 1520 only measured thrust. Measuring torque allows you to get precise calculations of the propeller and motor efficiencies.