... for water position.It is also named: Reflex Gauge Glass, Sight glass, Reflex GlassesReflex sight glass, Spares For level GaugeThe category is as follows:1 ... . Colour and LustreIt should be no color and transparent,and with its self tine green is allowed.3. Water-resistanceCooked in ... the water for 5 hours,then weigh up ,then titration with 25ml 0~31 ug/g4. Alkali-resistanceCooked in the 0 ...