The Trigger Tension Meter measures tensions on wires, yarns, fiber optic cables, films, tapes, narrow fabrics and flat materials. The contact elements are recessed into the trigger shield, which keeps material from snagging and/or breaking behind the rollers. Internal magnetic dampening assures an accurate tension reading no matter which position the meter is held in.

Note: Each instrument is calibrated to one specific material for a direct tension reading (typically the customer's choice). When measuring other materials, the meter will provide a repeatable reference but not a direct tension reading.

Click here to view Digital Wire and Textile Tension Meters


  • Portable
  • Versatile
  • Lightweight
  • Easy Operation
  • Durable Construction
  • Magnetic Dampening
  • Can Be Permanently Mounted
  • Right- or Left-Hand Operation
  • All new instruments are warrantied against defects in materials or workmanship for the period of one (1) year

Our instruments are utilized extensively in the major wire, textile, coil winding, EDM, fiber optic and synthetic materials industries. We have established a reputation for providing quality instruments which endure rigorous industrial and test applications.

Click here for the TR Data Sheet


Tensitron has a long time association with the wire EDM industry, dating back to the original American prototypes for this technology. Special EDM calibrations of our tension meters are performed to insure utmost accuracy for the instrument to the wire type. Typically these calibrated values mimic the calibration protocol for the Wire EDM machine and therefore help to ensure maximum accuracy of wire tension throughout its entire tension range. We are quite familiar with the requirements of measuring tensions on different types of EDM wires and are happy to make a recommendation for your specific application.

As a general rule of thumb, most mechanical tension meters must be calibrated to the specific EDM wire being used, to ensure accuracy. The Digital Tension Meter, P/N: TX-5EDM, already includes multiple calibrations for many different EDM wire sizes. If using the less expensive mechanical tension meter, we recommend our model P/N: TR-4000 specially calibrated to your wire size. For greater accuracy, flexibility, data logging capability and ease of use we recommend our digital model TX-5000-EDM-1 for EDM wire applications.

Model "TR" Series - Standard Models:

For North American sales, click HERE to receive a quote. For sales outside of North America, click HERE to reach a distributor. Contact Tensitron at 303-702-1980 or for details.

Model Number Range in Grams Accuracy*
TR-25 3 - 25 g


TR-125 3 - 125 g 7%
TR-250 3 - 250 g 7%
TR-1000 5 - 1000 g 7%
TR-2000 25 - 2000 g 7%
TR-4000 50 - 4000 g 7%
TR-5000 100 - 5000 g 7%

* Unless a "Special Calibration" is requested and a sample material is provided, the full scale accuracy in the first revolution of the dial is +/-7%. Tension readings beyond the first revolution of the dial are for reference only.


Narrow Web & Tape Applications

Tensitron TR meters can be equipped with different contact elements to easily measure tension in a wide variety of applications. TR units come standard with V-grooved pulleys for measuring wire and filaments. For special applications, such as thin tapes and webs, braided material, or tow, equip your meter with scooped, cylindrical, or flanged contact elements by ordering an “R” Custom Roller Option:

Standard Contact Elements

Custom Roller Options:

For North American sales, click HERE to receive a quote. For sales outside of North America, click HERE to reach a distributor. Contact Tensitron at 303-702-1980 or for details.

Option Description
-R (Cylindrical) Custom Roller Option: Cylindrical. Available in ½” or 1” width. Recommended for flat material. Allows for testing the edge of a wide strip.
-R (Scooped) Custom Roller Option: Scooped. Recommended for braided or “loose” material. Avoids snags and keeps material spread evenly.
-R (Flanged) Custom Roller Option: Flanged. Recommended for flat material. Edges prevent sliding.


All Trigger Tension Meters have a dial face that use the black numbers in the first revolution of the pointer and red numbers in the second revolution. Tension readings (in red print) beyond the first revolution of the dial are for reference only.

Model Number Dial - First Revolution (Black numbers)
TR-25 0 to 25 g
TR-125 0 to 50 g
TR-250 0 to 100 g
TR-1000 0 to 250 g
TR-2000 0 to 450 g
TR-4000 0 to 500 g
TR-5000 0 to 650 g


Universal Mounting Bracket

All Trigger Tension Meters can be mounted in a fixed position for in-line tension monitoring by means of a mounting bracket which is sold separately. The mounting bracket allows either intermittent or continuous readings, as required.

TR-700 Meter Mounting Bracket, TR Series


Operating Instructions

Squeeze the trigger to separate the three rollers. Insert material (yarn, wire, web, etc.) between the contact elements so it rests against the trigger shield and slowly release the trigger. The center roller deflects as the tension in your material increases. As the pointer makes its first revolution read the BLACK outer dial for the correct tension. Should tensions increase and the pointer begin a second revolution, read the RED inner dial. To release the material, slowly squeeze the trigger and remove the tension meter.


The right tension for a yarn is in the vicinity of .15 to .35 grams per denier. If you are using a rayon yarn which is running 100 denier 40 filament, tensions probably lie between 15 and 35 grams. Safe tensions change with the material of the yarn and its number of filaments. (E.g., nylon requires a lower tension while cotton permits the use of higher tension). For proper coverage of 15-35 grams, the model TR-125 instrument is recommended.


Tensitron calibrates instruments using the “free hanging weight” method. This means that we vertically suspend an accurately-sized material, attach a NIST-certified weight to the bottom of it, engage the instrument on the material, and the tension reading on the instrument will correspond to the amount of the weight. If you require a different calibration method, please contact Tensitron.

To verify the accuracy of your Tensitron meter, use the “free hanging weight” method as a standard rather than comparing your meter’s readings to those of another gauge. Also do not use a tensioning device that converts rotational torque into tension values, and do not simulate tension using a calibration bar, because these systems are often inaccurate and may damage your meter. If you need assistance, please refer to your meter’s Operating Instructions or contact Tensitron.


For damp materials or operation in a damp atmosphere, the Model "RT" Series has internal parts made of stainless steel, plastic, gold-plated steel, copper and other materials and treatments which minimize the damage due to moisture. Although this instrument is not waterproof, it should give excellent service under conditions where it is exposed to an occasional spray. All trigger meter tension ranges are available in the "RT" Series.