PROFORM's new billet aluminum 1000 lb digital bench top spring tester is the most accurate way to check spring pressure. Check springs up to 1.9in diameter and 3 7/8in height. Digital display reads in 1 lb (0.5 kg) increments, and has a back lighting feature. Peak hold and automatic shutoff are other included features. Tech Specs: RAM Travel: 3 7/8in. Upper Anvil: 2 1/4in dia. Lower Anvil: 1.9in dia. Scale in inches and mm, pressure in pounds and kilograms. Resolution 1 lbs or .5 kgs. Accurate calibrated test springs are available at www.Rimac-Tools.com