Hang on Tank Drop Checkers

[tubamanandy]

Anyone know if its possible to buy a hang on drop checker for thickish glass and quite long ?

I've seen the type I want but my glass is too thick and the drop to the water too long - any ideas ?

 

[Nelson]

http://www.ukaps.org/forum/threads/bespoke-made-glass-drop-checker-for-large-aquarium.40628/

 

[tubamanandy]

How do you get hold of one ? Looks ideal