​674 Rain Gauge

Connects directly to 6712 and Avalanche Samplers, 4200 Flowmeters, and 4100 Flow Loggers

674 Rain GaugeThe Teledyne ISCO 674 Rain Gauge is a precision instrument that uses a tipping bucket design for accurate rainfall measurement. It has an 8 inch diameter orifice and is factory-calibrated to tip at either 0.01 inch or 0.1 mm of rainfall. With a 674 Rain Gauge connected, a Teledyne ISCO flowmeter or sampler will:
  • Plot graphs and print reports of rainfall data on the flowmeter’s built-in printer
  • Store rainfall data in internal memory for retrieval and analysis with Teledyne ISCO Flowlink® Software​
  • Activate sampling based on rainfall



When you purchase instruments from Teledyne ISCO, you not only receive innovative, high quality products, you also receive excellent customer service and product support. Your initial purchase is only the beginning of Teledyne ISCO's ongoing commitment to their customers.


Teledyne ISCO Water & Wastewater Product GuideBrochure
674 Rain Gauge DatasheetDatasheet
674 Rain Gauge User ManualUser Manual


​​​​​​​​​​​​​​​​​​​​Rain Gauge

Type: Tipping bucket
Compatible equipment: Teledyne ISCO 6700, 6712, and Avalanche Samplers, 4200 Series Flowmeters, 4100 Series Flow Logger, Signature Flowmeters
Connect cable: 50 ft. (15.2 m), 2 conductor with 4-pin plug
Bearings: Spring-loaded sapphire jewel
Orifice Diameter: 8 in. (20 cm)
Sensitivity: English - 0.01 inch; Metric 0.1 mm
Accuracy: English - ±1% at 2 in/hour; +3%/-4% up to 5 in/hour. Metric - ±1.5% at 5 cm/hour; +3.5%/-9% up to 13 cm/hour
Capacity: English – 22 inches/hour; Metric – 38 cm/hour
Output Signal: Contact closure of at least 50 millisecond duration
Switch Type: Normally open, encapsulated reed; 10 watts, 200V DC, 0.5 A maximum
Height: 13 in. (33 cm)
Diameter: 9.5 in. (24 cm) (at mounting base)
Weight: 10 lbs. (4.5 kg)
Operating Temperature: 32° to 140°F (0° to 60°C)
Storage Temperature: -40° to 140°F (-40° to 60°C)

​For a full list of product specifications, see the datasheet.



 Standard Features
  • Three-point leveling and integral bubble level make it easy to align the rain gauge for maximum accuracy.
  • Sapphire jewel bearings on the tipping bucket are spring-loaded to prevent damage to the bearings and ensure consistent operation over a wide temperature range.
  • Screens cover all openings to prevent leaves, insects, and other debris from clogging the gauge.
  • Included 50-foot cable connects directly to compatible Teledyne ISCO flowmeters and samplers.


  • Stormwater runoff monitoring
  • Inflow and infiltration studies
  • Combined sewer overflow monitoring
  • CMOM and CSO/SSO pro​grams (Sewer overflow monitoring and prevention)
  • General rainfall measurement

Options and Accessories

  • English units - tips every 0.01 in. of rainfall
  • Metric units - tips every 0.1 mm of rainfall