A versatile self-contained unit designed for cutting a wide range of materials with minimum deformation. The as-cut surface is smooth and requires little additional preparation for microscopic examination. The saw operates at low speed using a precision diamond wafering blade with 'immersion' lubrication. For safety, all low voltage circuitry is employed for switching and motor speed control which is continuously variable. The saw is supplied complete with clamp, arbor, diamond blade and weights.