Designed for years of dependable use in the busiest labs. Use for routine testing and for RPR, VDRL, latex tests and other procedures that require a non-standard speed. Item: RTL-BLV7-2501 Ideal for all routine testing. Variable speed 45-250rpm. Includes 30-minute timer and built-in analog tachometer. Designed for timed or continuous operations. Includes hold-down spring for small flasks and moisture cover for RPR.