Force Displacement Test Station

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The Sapphire switch force displacement test station is designed for accurate, repeatable force and displacement measurements of various types of tactile switches and switch assemblies. The Sapphire is a stand alone unit that tests and displays precise measurement data on an LCD touch screen display. Full measurement reports can be uploaded to your network or a USB drive.

The Sapphire switch force tester is used to test metal domes, poly domes, membrane switches, and most other switches. The force test station follows ASTM standard F2592. Tests include trip force, return force, standing free height, displacement (travel), tactile ratio, tactile activation slope, switch resistance, and other ASTM measurements. It can detect two separate electrical contacts and it can be used to characterize resistive touch screens. The Sapphire is an invaluable testing tool to ensure force-displacement compliance for your quality control department.

In stand alone operation the user can get test data and reports directly from the LCD screen. In-depth reports may also be generated in Excel via your company’s network. The Sapphire also has two USB ports that can save reports when a drive is detected.

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Benefits include:

  • Measures trip force, return force, free height, displacement, tactile activation slope, and resistance
  • Ability to specify Pass/Fail parameters Sapphire Pic Web 2
  • Tests a variety of mechanical switches and switch assemblies, and can be used to characterize resistive touch screens
  • Follows ASTM standard F2592
  • Access reports through your network, or via USB flash drive
  • Intuitive touch screen display for easy operation and results
  • Two resistance circuits to measure multiple electrical contacts
  • Compact design, portable
  • Adjustable test head for a wide range of product heights
  • Custom specifications available
  • Non-Tactile test mode allows for testing and creating a force-displacement curve for switches or other objects that do not have a tactile inflection
  • Process Data box allows for logging of all ASTM values for a series of tests
  • ASTM values include Fmax, Tfmax, Fmin, Tfmin, Frmax, Tfrmax, Frmin, Tfrmin, Travel, Free Height, Tactile Ratio, Fc1, Tc1, Fb1, Tb1, Fc2, Tc2, Fb2, Tb2, Ftease, Ttease, Frtease, Trtease, Ffactor, Tfactor, Frfactor, Trfactor, TAS, TRS, and Fend
  • Raw Curve Data option will generate a report containing force vs. position data for each force test conducted
  • Lease Program available
OptionsSpecificationsSystem Components
Standard Sapphire® test stations can be modified to meet your specific needs. For more information on custom modifications, contact Snaptron at 970.686.5682. In addition to the test unit, Snaptron can provide the following:

  • Custom 20lb load cell (10lb standard)
  • Neck height spacers (to increase throat height)
  • Actuator tip kit (Includes actuator tips in 0.10”, 0.15”, 0.20”, and 0.25” sizes)
  • Custom testing platforms
  • Calibration Kit
  • Supply Voltages for Resistance (5V standard, optional 12V or 24V)

Web Pic - Option Contact Snaptron for more information.

  • Measurement units: Force (grams, newtons, ounces), Travel (inches, mm)
  • Test unit – 13”H x 9”W x 12.5”D (330mmH x 229mmW x 318mmD)
  • Test unit weight – 18 lbs.
  • Throat dimensions: Standard height = 5.4” (137mm)
  • Standard depth = 6” (152mm)
  • Test speed: 0.050” (1.27mm) per second
  • Total tip travel: Up to 1.2” (30mm)
  • Power requirements: 100-240 VAC, 50-60 Hz, 1.4 A

Displacement (travel)

  • Range: Displacement of 0 – 0.2” (5mm)
  • Resolution: +/- 0.0001” (0.002mm)
  • Absolute accuracy: +/- 0.0010” (0.025mm)
  • Repeatability: +/- 0.0005” (0.013mm)


  • Range: 0-3000g (30N, 106oz)
  • Resolution: 1g (0.01N, 0.03oz)
  • Absolute accuracy: +/- 5g, (+/- 0.05N, 0.20oz)
  • Repeatability: +/- 3g, (+/- 0.03N, 0.10oz)

Tested Parameters

Force Measurements

  • Fmax = trip force
  • Fmin = minimum force after Fmax
  • Fc = force at contact*
  • Fb = force at break*
  • Frmin = minimum force on return
  • Frmax = maximum force on return
  • Tactile ratio
  • Tactile activation slope

Travel Measurements

  • Tfmax = travel to Fmax
  • Tfmin = travel to Fmin
  • Tc = travel to contact*
  • Tb = travel to break*
  • Trmin = travel to Frmin
  • Trmax = Travel to Frmax
  • Tend = Travel at end of test

Resistance measurements

  • Rend = Resistance at end of test * The SAPPHIRE has the ability to measure the force and travel of two separate electrical contacts (Fc, Fb, Tc, Tb) of a dual-action tactile switch.

  • Actuator tip (0.050”) (1.27mm) diameter flat bottom
  • Resistance test cables (2)
  • Travel case
  • Operator’s manual

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