PTL  
德国PTL公司成立于1946年,有着50多年的实验检测设备的生产经验，是国际IEC电工委员会的实验室检测设备指定厂家。德国PTL公司的产品有：灼热丝、漏电起痕试验仪、耐划痕测试仪、多档可调的弹簧冲击锤，试验指、针、销、球压试验装置、滚筒跌落、IP1/8的防水试验设备和防尘试验设备等。目前中国大陆的已经在使用的实验室有：上海出入境检验检疫局、浙江出入境检验检疫局、青岛出入境检验检疫局、广州出入境检验检疫局、深圳出入境检验检疫局、上海电线电缆研究所等。
PTL is a continuation of an electrical workshop founded in 1946 in Bamberg by Master Engineer Georg Müller under the name PHYS.-TECHN. LABOR. In the course of time, test equipment took a dominating role in the manufacturing programme.
In 1965, the domicile was transferred to Stadtsteinach. The company was taken over by Dr.-Ing. Dieter Grabenhorst in 1974 after the death of the founder. Since the 1st of January 1984, the registered name is PTL Dr. Grabenhorst GmbH. In 1986 the buildings were acquired and enlarged, where PTL is accommodated today.
The following years stood out for continuous expanding on the areas quality assurance, product and production improvement and international partnerships.

Aim and Purpose of PTL Test Equipment 
 
By means of PTL test equipment proof can be furnished, that products and prefabricated items meet the required standards concerning safety, suitability and reliability. Therefore, quality- and testing laboratories would be unthinkable without our testing equipment.
Constantly rising prices effect that the following question gains more and more emphasis:
How can technical security and qualitative standards be maintained, even if materials and working hours are economized?
The PTL test equipment is at your disposal for the objective answering of this question.
 
 
Since we are addressing ourselves to specialists, we have in our product information maintained the sober language of the technicians, free from customary superlatives.
PTL product information are available as printed prospectuses, combined to a complete catalogue, too, and partly as HTML files.
There is an individual information on every product or product family. At the head of the information is stated for which test objects and test criteria the respective PTL test equipment is suitable. In the following there is pointed at the relevant regulations. In the main part, the standard outfit and the design are defined in detail.
For a lot of standards we can make product schedules available. These schedules give a survey concerning the tests pointed out in the respective standard, which can be performed by means of the PTL test equipment.
 
 
Among our customers are e. g. testing institutes for electrical safety and accident research, for industrial supervision, Technical Control Boards as well as the electrical industry and the plastics industry. PTL has customers in almost all regions in the world.