Yes, you can use a spring compressor to measure the spring constant of an aluminum coil. The spring constant (k) can be calculated using Hooke's Law, which states that the force exerted by a spring is proportional to its displacement (F = kx). By applying a known force to the spring and measuring the resulting displacement, you can calculate the spring constant. A spring compressor can apply a controlled force, and a displacement gauge can measure the compression, allowing you to determine the spring constant accurately.