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

The 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


  • Brand


Isco Samplers


  • 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


  • English units – tips every 0.01 in. of rainfall

  • Metric units – tips every 0.1 mm of rainfall​


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)
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