Hign-concerned Chemical: None Type: Hand Tool Parts Model Number: 2090 Type: stringing machine calibrator Product name: racket pounds calibrator Min pull: 1 lbs Max pull: 90 lbs CARE OF THE 2090 After 10 seconds of inactivity the backlight turn off. After 4 minutes the machine turn itself oft. and hold the ONJIOFF for 5 seconds to turn the 2090 off. Never pull more than 90 pounds. The calibrator requires two 2032 Lithium batteries. The 2090 a sophisticated electronicdevice. Treat it with care and it you for a long time. After testing more than 2000 times you may want to returm the 2090 for re-calibration. CALIBRATOR The Tennishead 2090 A calibrator helps keep your stringing equipment in top working order. The 2090 can be used on any stringer, mechanical (crank) electronic or drop weight. To begin, set your machine to 60 pounds, about 27 kg Use a short piece of string. Loop itthrough one link and clamp it firmly to the machine. Use another string, loop it through the calibrator link and to of your machine. Do not tension now. the ONIOFF switch. fter 2-3 seconds the 0.00 appear. Support the 2090 so there is no tension displayed. Now feed into and pull. Compare the results. Color: Yellow Material: plastic Package Contents: 1 * Calibrator Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.