Abstract: An improved tensiometer for measuring the amount of tension in a wire or cable comprises a hand-held sensor unit having a handle, two spaced support arms supporting cable-engaging support nibs, an extensible sensor nib protruding from the handle, and a trigger grip operable to extend the sensor nib upwardly between the support nibs to deflect a portion of cable clamped therebetween. The support nibs are eccentric and rotatably adjustable between a plurality of settings to permit the sensor unit to accommodate a number of different cable diameters, and the throw ratios of the nibs are arranged to minimize their eccentricity and the resulting variation in length of the deflected portion of cable at different settings. The sensor unit measures the force required to deflect the cable with a load cell, the output of which is converted into and displayed as a tension value by a microprocessor display meter connected to the sensor unit.