Most popular, adjustable pressure, spring activated cutaneous probe for treating or locating trigger points, acupoints, or ear points. 5" long modulator includes 3" x 0.4" dia grooved handle and 1.8" spring loaded probe with rounded tip (does not puncture skin). The other end features a powerful 2,000 gauss magnetic ball probe (4 mm dia) which may also be used for acu-pressure and acu-massage. The polarity may be easily changed from bio-north to bio-south pole by removing the ball probe and reversing the magnet's position. Includes five interchangeable, different strength springs: 100 gm = green, 150 gm = yellow, 200 gm = white, 250 gm = purple, 300 gm = red. White colored spring is supplied with unit in clear plastic box.