zeiss

• At present , four manufacturers , leica , zeiss , topcon , sokkia , introduced different models of digital levels to the surveying market with different measurement principle and code staff
  目前徕卡、蔡司、拓普康、索佳四家公司相继推出了各自的数字水准仪产品，不同厂家的仪器采用了不同的电子读数原理和标尺编码结构。