The G645 front mount closed circuit sight gauges provide front viewing of the fluid level clearly delineated by a redline on white background integral to the glass sight all secured within an aluminum body (HIGH-LOW markings). A dry dial thermometer allows for temperature monitoring. The thermowell for the thermometer also serves as one of the mounting bolts for the sight gauge. This construction allows the thermometer orientation to be adjusted independent of the sight gauge and removed if necessary without having to drain the reservoir. Standard Features: Centerline lengths from 5 to 12 inches Front mount .90 inch SQ body machined from extruded aluminum bar stock Fluid level visible from front of gauge (.50 inches wide) Viewing enhanced by redline on white background integral to sight glass HIGH-LOW markings on aluminum body 2.00 inch diameter dual scale dial thermometer, 0° to 300°F and -20° to 150°C Dial thermometer may be removed from a filled reservoir without loss of fluid 1/2-20UNF mounting studs accommodate reservoir wall thicknesses up to .62 inches Suitable for use with most hydraulic and machine lubricating oils Caution: Not recommended for use with steam, acidic fluids, caustic fluids and volatile fluids. If aluminum construction is selected for a water application, anodizing is recommended.