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Climalytic Tropo Precipitation/Rain Gauge (Metric & Imperial)

The Tropo Precipitation Gauge by Climalytic Instruments
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Introducing the new Premium CoCoRaHS Gauge

The CoCoRaHS logo.

CoCoRaHS Statement

"CoCoRaHS Headquarters is pleased to designate the TROPO rain gauge, manufactured by Climalytic Instruments, LLC, as another approved manual 4-inch rain gauge for CoCoRaHS. Field testing has demonstrated the TROPO rain gauge is accurate, and it incorporates observer-friendly features such as greater capacity, improved mounting bracket, and multiple mounting options."

The next gen precision precipitation gauge

The TROPO Precipitation Gauge is the next generation 4-inch all-weather professional precipitation gauge that meets the accuracy and specification requirements of CoCoRaHS. It’s the first comprehensive refresh of the Stratus Precision Rain Gauge, which was first introduced way back in 1973 – almost 50 years ago! Based on the design of NOAA’s National Weather Service official standard 8” rain gauge, the TROPO Precipitation Gauge uses the same dual cylinder design to measure precipitation with a resolution of 0.01” (.25 mm). The inner cylinder holds 1 inch (25 mm) of precipitation, while the extra-large outer cylinder holds another 12.5 inches (317.5 mm) of precipitation when the inner tube is full. The inner cylinder and funnel top 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. This new gauge offers over 12 new distinguishing features that makes it the most advanced, accurate and easy-to-use manual precipitation gauge on the market.

Product Specifications

Size, without bird deterrent rods (L x W x H):

102 mm x 102 mm x462 mm (4 in x 4 in x 18.19 in)


762 g (1.68 lbs)

Maximum Capacity:

342.9 mm (approximately 13.5”)


+/-.25mm (.01”)


  1. Bracket & handle: UV stabilized Polycarbonate/acrylonitrile butadiene styrene (PC/ABS)
  2. Cap funnel & cylinders: UV stabilized Polycarbonate
  3. Bird deterrent rods: Stainless steel
  4. Zip ties: UV resistant nylon
  5. Wood screws: Zinc-plated steel

 What's Included

• Handle 
• Universal Mounting Bracket
• Bird Deterrent Rods (x8)
• Cap/Funnel
• Inner Tube (with dual unit increments)
• Outer Tube (with dual unit increments)
• Cable Ties (x2)
• Wood Screws (x2)
• Adhesive Strip
• Extra Long Cleaning Brush
• Bubble Level
• Installation Guide

Gauge Comparison

Field Trial of the CoCoRaHS TROPO Precipitation Gauge

Richard Griffith (FRMetS) has been doing a thorough trial on the new CoCoRaHS TROPO Precipitation Gauge.

You can read all about Richards trial and his findings here: Field Trial of the CoCoRaHS TROPO Precipitation Gauge

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