Our first product was a custom made non-standard double-sided hotplate. It is used for investigating textile material package insulation, evaporative resistance1. It has also been used for evaluation of the performance of PCM (phase change material) in dry and wet conditions2. The hotplate has one measuring zone on both sides of the plate, each surrounded by a guard zone and with an additional guard zone at the sides.
a) 
b) 
Dry (a) and wet (b) sides of the hotplate.