Stone Technology Development Co., Ltd. Shanghai Branch, has a trademark Costa, Costa focused on fluorine-based trace gas analysis, leading a fluorine-based gas analyzer developed three series of main products companies: SF6 Leak class Lf series of quantitative micro water instrument, line detection system; Ks139 series of air-conditioning for leak; gas pipe fittings, container sealing sets of leak detection devices; SF6 class Lf series of quantitative leak detectors, moisture meter, line detection system SF6 Leak quantification main products Lf -1d, Lf-1e, Lf-1d +, Lf-200, Lf-300 and other products developed using high-frequency magnetic field principle, low high-frequency ionization products without radiation, safe, reliable, durable, easy to probe no damaged parts, routine maintenance costs low detection accuracy 0.01ppm; Lf-300 which uses interactive LCD touch screen control, display ppm (v), accurately display 0.01ppm, configurable external lithium power inverter, 3-year product warranty ; Other products: KST-Ⅲ intelligent micro-water meter; Ks100, Ks200 such as SF6 comprehensive online detection system; patented technology, industry-leading! Taller Group, Thailand opened the high-pressure, high-pressure supporting co Tarzan, the source shares, China High Voltage Switchgear Association. Ks139 series dedicated air conditioning leak main products are Ks139, Ks139h, Ks139t etc; proven leadership position in the industry, due to its high sensitivity, fast response, stable characteristics, widely used in automotive air conditioners, central air conditioning. Leak from the vague to the exact leak, to overturn the traditional, air leak new standards, environmental protection and energy saving benefits the country; the product won the 2011 China Automotive Air-conditioning Ten Innovation and Technology Achievement Award; 2011 China Auto Repair "TOP20" Maintenance Tools Award; Shanghai Science and Technology Progress Award; General Motors, Volkswagen and other designated supporting maintenance and inspection tools; gas pipe fittings, container sealing sets of leak detection devices using R23 as the detection medium, dry leak after leak specimen without dried, high leak detection accuracy, precision up to 5 × 10-12Pa.m3 / s, R23: 0.1 g / year; workpiece and the double pipe recovery, fast and efficient recovery of up to 98%, to ensure low production cost, man machine interface, real-time monitoring and diagnosis; automatic judgment, sound and light tips and output devices, digital display test results; reliable, the system uses high-end configuration, to ensure reliable performance, automatic fault detection; tact and vacuum chamber customized according to customer workpiece size ; products are widely used in high-voltage switchgear, SF6 density relays, circuit breakers, air conditioning condensers, evaporators, heat exchangers, air-conditioning piping, compressor, radiator, oil cooler car, automobile pipeline, transmission, fuel tank, engine , pressure valves, reservoir, fire extinguishers.