Dual indicator VAS with mirror movement

[Graeme Davidson]

Hello there,

I was wondering if anyone could help me with a problem.

I'm trying to design a visual analogue scale with two indicators which have 
reflective movement on the same scale line. So essentially a participant 
would see an image and then be asked to rate the weight of the image. I 
have no problems doing this on a single indicator VAS but my research 
supervisor would like it so that there are two indicators, and when you 
move one the other indicator moves in a mirrored movement. The best I could 
describe it as is a vice movement so when one indicator move out from the 
centre of the scale the other indicator moves out from the centre too. 

Does anyone know how I'd go about designing such a scale? 

I'd appreciate any help, on how to program this movement. 

all the best

Graeme

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