Approved as the "Premium CoCoRaHS Gauge", the TROPO is a 4-inch diameter, all-

weather, professional rain and snow gauge. 

Inspired by the original Stratus Rain Gauge, and based on NOAA’s National Weather 

Service official standard 8” rain gauge (SRG), the TROPO Precipitation Gauge uses the 

same dual cylinder design to measure rain and snow water equivalent (SWE) to the 

nearest hundredth of an inch (0.01 in) or fifth of a millimeter (0.2 mm). 

The inner cylinder holds 1 inch (25.4 mm) of precipitation, while the extra-large outer 

cylinder holds another 12.50 inches (317.5 mm) of precipitation making the maximum 

capacity approximately 13.5” (343 mm). The inner cylinder and locking funnel cap are 

removable to allow catchment of snowfall or other frozen precipitation, which can then 

be melted down or weighed to determine a liquid equivalent. 

The gauge is made of a premium UV stabilized polycarbonate — the same weather 

resistant material used to build greenhouses. The TROPO is freeze-resistant if regularly 

maintained, emptied, and cleaned. 

Features 

• 13.5” (342.9 mm) maximum capacity 
• Textured grips on outer cylinder for secure handling of the gauge 
• Marine grade stainless steel bird deterrent rods (optional, can be removed) 
• Inner cylinder equipped with stabilizing base for easy filling 
• Funnel opening atop inner cylinder for easy filling without outer tube cap 
• Beveled guide on bottom of outer cylinder allows inner cylinder to easily slide in place 
• Outer cylinder graduations for quick, estimated readings. Not to be used for CoCoRaHS reports 
• Removable handle for easy handling and pouring of the unmounted outer cylinder 
• Weather-resistant, universal mounting bracket for pole or post installation 
• Snap-on funnel cap 
• Extra tall cap walls for more accurate catchment of precipitation 
• The white graduations and numerals allow for clear visibility in both bright and dark conditions 

Benefits 

• Obtain more accurate precipitation measurements with fewer measurement mishaps 
• Prevent bird-related problems by installing the included bird deterrent rods 
• Safe, easy operation with textured grips and removable handle 
• Save time and avoid potential damage while dismounting the gauge in icy conditions 
• The locking cap reduces the likelihood of losing the cap in high wind 
• Fewer gauge overflows during extreme events or long accumulation periods 
• Save time installing and operating the gauge 
• Freeze-resistant when maintained regularly 
• Everything you need is included in the box 
• Extra/individual parts are available if you ever lose one piece

Dimensions and Weight 

Gauge catchment diameter: 4 inches (101.6 mm) 

Gauge height (with bird deterrent rods): 20.5 inches (523.2 mm) 

Gauge weight (with bird deterrent rods): 1.73 lbs (786.3 g) 

Materials 

Gauge: UV stabilized polycarbonate 

Bird deterrent rods: 316 stainless steel 

Cleaning brush bristles: nylon 

In the Box 



Inner Tube (mm & in) 

Outer Tube (mm & in)

Cap/Funnel 

Bird deterrent rods (x8) 

Universal Mounting Bracket 

Removable Handle 

11" Cable Ties (x2) 

Wood Screws (x2) 

Adhesive Strip (for frictional grip to pole mount) 

Long cleaning brush

Bubble level 

Installation and User Guide