The Rimac Spring Tester is specifically designed for quick and easy, rapid spring testing. The upper and lower platforms are 2-1/4 in. and 3-1/4 in. diameter, respectively. The cast aluminum body, with holes for bench mounting, is as durable as ever, and powder coated in familiar blue. There are two models: 0-1000 lbs. and a 0-500 lbs. The 4-1/4 in. diameter analog gauge is easy to read with bold black numbering and graduation marks in both pounds and kilograms.