Get the best crop yield by measuring the extent and depth of subsurface compactionPenetration Depth: Up to 24, in 3 increments.Colour coded Stainless Steel dial.Green test range: 0-200psi.Yellow test range: 200-300psi.Red test range: 300psi. and aboveSupplied with 1/2 tip for firm soil & 3/4 tip for soft soil.