GAMMA ERT 300 User Manual
Know when to restring

All string materials start loosing tension after the racquet is strung through repeated
impacts and through aging even if it has not been used
Restring the racquet when the DT-value has decreased
by 10% to maximum 20%
Never play tennis when the DT-value below 28 !
(Low ball control, risk of tennis elbow and back problems)
Technical data ERT 300 TENNISCOMPUTER
Field of application
Tennis racquets
Dynamic system
Electronic simulation of ball impact
Measuring of the resonance frequency
Converting the string bed stiffness DT
DYNAMIC TENSION DT
20...65 DT (kp/cm; Newton/mm)
Accuracy
+/- 1 kp/cm (+/- 1 digit)
Display
Measurement 4...6 sec., Display 8 sec.
Dimensions
110 x 50 x 25 mm
Weight
50 g
Ambient temperature
5...45˚ Celsius / 40...115˚ Fahrenheit
Relative humidity
20%...80% (not waterproof)
Batteries
2 x CR 2032 coin type
Replace batteries when battery sign appears in display.
Caution: Do not loose the tiny screws.
Always use a proper desk top.
plus pole up
All rights reserved
BEERS Technic GmbH
Professional Sports Equipment
CH-6330 Cham, Switzerland
www.beers-technic.ch
Know when to restring
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