PASPORT High Accuracy Drop Counter - PS-2117



At last, a professional quality Drop Counter can become part of your student lab. Our Drop Counter has a wider drop window (18 x 13mm) for better drop detection and easier alignment with burettes. Works equally well with large or small, fast or slow drops. Easy calibration requires entering just one number into the computer.

  • Measures up to 40 drops per second with drops as small as 0.64 mm.
  • Silicone rubber-sealed polypropylene enclosure is fluid-resistant and protects sensor from mild acids and bases.
  • Automatically recalibrates for maximum sensitivity each time the unit is turned on.
  • Holds up to three probes in a 150 mL beaker
  • LED drop indicator
  • IR filter rejects all visible light - not susceptible to variations in room lighting

Now includes a Micro Stir Bar for even better titration data. The Micro Stir Bar connects to the end of your pH or Conductivity probe and maintains a constant constant flow of solution over the end of the electrode. Works with a standard stir plate. (Additional Micro Stir Bars are also available separately.)

Typical Applications

  • Determine the equivalence point
  • Simple counting activities

Special Features

  • Holds up to three sensors in a 150 mL beaker
  • LED drop indicator
  • UV filter rejects all visible light - not susceptible to variations in room lighting


  • Drop Counter
  • Micro Stir Bar
  • 60 mL Syringe
  • Stopcocks (2)
  • Drop Tip
  • Support Rod
  • Specifications

    Maximum Drop Count Rate
    • 40 drops per second
    Minimum Object Detection Size
    • 0.64 mm
    Drop Window
    • 18 mm x 13 mm
    • Polypropylene, water resistant, chemically resistance to mild acids and bases.
    Detector Type
    • Infrared photodetector with collimating lens
    Default Sample Rate
    • 5 Hz
    Maximum Sample Rate
    • 10 Hz


    Buying Guide

    Interface Required

    To use this product you need a PASCO interface. 

    New to probeware or have questions about  sensors or interfaces? Contact Teacher and Technical Support.  We're here to help!

    Software Required

    SPARKvue software or PASCO Capstone software may be used. PASCO Capstone is available for Mac and Windows. SPARKvue is available for Mac, Windows, iOS, Android and Chromebooks.

    Learn more about Bluetooth Compatibility.