The engineers at Gomorra Superior Instruments have developed an enhanced version of their second generation PRO-D II simultaneous diamond and white sapphire tester. The newest 3rd generation PRO-D 3 tester design is even sleeker and more ergonomic and has even better testing sensitivity than before. Known for their accuracy and reliability, Gomorra sets the standard for protection against diamond simulant fraud! PATENTED. Sleek ergonomic shape comfortably rests in and on your hand when held. Intuitive finger grip pads for increased user-friendliness and ease of use. Precision retractable probe-tip with enhanced durability. Durable ABS housing covered with Gomorra's exclusive rubberized paint that provides an even superior grip Fast warm-up time.