Model B - 3000(J) : Simplest model of Brinell Hardness tester with mechanical design, loading, unloading manual, best suitable for testingbatch quantities.Model B - 3000(H) : Machine designed with a hydraulic power pack & control circuit for effortless loading unloading operation. A dial gaugein front measures depth of ball penetration. This facilitates production testing within tolerance limits by compression method.Model B - 3000(J) : Simplest model of Brinell Hardness tester with mechanical design, loading, unloading manual, best suitable for testingbatch quantities.Model B - 3000(H) : Machine designed with a hydraulic power pack & control circuit for effortless loading unloading operation. A dial gaugein front measures depth of ball penetration. This facilitates production testing within tolerance limits by compression method.