Nr. 90/20   No. 90/20 大型立式玻璃應力檢測儀   Big stand model 光源：E 27螺口燈泡, 150瓦 – 230 伏, 50Hz 分析器直徑：                                   200 mm 偏光器直徑：                                   400 mm 偏光器和分析器之間較大距離：      約 600 mm                                                               Light source: bulb with thread E 27, 150 Watts  – 230 Volts, 50 cycles Diameter of analyzer:                                              200 mm Diameter of polarizer:                                              400 mm Max. distance between analyzer and polarizer:                                                                        appr. 600 mm .   All units are delivered with appr. 3 m cord and plug.   Bulbs for other Voltages can be delivered upon request.