Qingdao Haitongda 6-Speed rotational viscometers are direct-reading instruments which are available in six- speed designs for use on either 50 Hz or 60 Hz electrical power. The standard power source is 220 volts, but all models may be fitted with a transformer, making operation with 220/110 volts possible.

Qingdao Haitongda 6-Speed rotational viscometers are used in research and production. These viscometers are recommended for evaluating the rheological properties of fluids, Newtonian and non-Newtonian. The design includes a Rotor Sleeve, Bob, F1 or F0.2 Torsion Spring, and a stainless steel sample cup for testing according to American Petroleum Institute Recommended Practice for Field Testing Water Based Drilling Fluids, API RP 13B-1/ISO 10414-1 Specification.