Defender Body Fat Caliper uses new technology with a Visual Pressure Indicator (VPI) for accurate results. The VPI changes from red to green when users have the correct skinfold reading. Also, the readings stay fixed after squeezing for easy recording and tracking. The Defender comes with a Results Slide Wheel to easily display body fat % results - no complicated charts are needed. Free with purchase - OrbiTape Body Tape Measure lets users measure ANY body part: biceps, forearms, chest, waist, hips, calves, quads. 60 inches Fits All Body Shapes Anatomically Correct Lifetime Guarantee. Constant Tension Technology ensures that OrbiTape is the most accurate body tape measure by placing a slight tension on the tape, while retracting excess tape into its body.