Pro-face GP-3500 Series Replacement Manualbook page 13

2.2 Touch Panel Specifications (only when replacing GP-4501T)
For replacement with GP-4501T, the Matrix resistive film type which enables
simultaneous 2-point touch input or the Analog resistive film type with 1-point touch
input only can be selected.
When you use 2-point touch input (touching 2 points on the screen at the same time),
please select the Matrix resistive film type. PFXGP4501TMA (AC power supply type) or
PFXGP4501TMD (DC power supply type) is available.
When you replace GP-4501TW (only the Analog resistive film type), unlike GP-3500
series you use, even if two different points are touched at the same time, that's
recognized as touch input on the middle coordinates between those two points.
GP-4501T Analog
Matrix
GP-4501TW Analog
Only the first detected touch is effective.
Simultaneous 2-point touch operation is supported.
When two different points are pushed at the same time,
touch input on the middle coordinates between those two
points is recognized.
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