Planar PT1501M User Manual page 6

Touch Screen for PT1500M(U)
Resistive for finger and pen interface
Surface : Anti-glare treatment
Interface : Serial (PT1500M), USB (PT1500MU)
Durability : 1,000,000 activations at a single point
Hardness of surface : 4H per ASTM D3363-92
Operating force : Stylus - <25 g (average)
Transmissivity : 85% + / - 2% (typical)
Haze : 5%
Clarity : 80%
Driver : Windows 95/98/Me/NT/2000/XP,
Linux
Finger - <50 g (average)