Features:_x000D_ _x000D_ Made from acrylic, convenient to clean and not easy to scratch glass and fish tank. _x000D_ The probe holder holds up to two probes simultaneously. _x000D_ The maximum fixing thickness for glass thickness is 1.5cm. _x000D_ It can be installed in your aquarium and filter tank. _x000D_ High quality and brand . _x000D_ _x000D_ Specification:_x000D_ Condition: Brand _x000D_ Material: Acrylic_x000D_ Size(L*W*H): approx.8*6*4.5cm / 3.15*2.36*1.77in_x000D_ Hole diameter: 1.3cm / 0.51in_x000D_ Color: As shows in pictures_x000D_ _x000D_ Package List:_x000D_ 1* Probe Holder_x000D_ 4* Screws_x000D_ _x000D_ Notice:_x000D_ Please allow 1-2cm error due to manual measurement and make sure you do not mind before ordering._x000D_ Please understand that colors may exist chromatic aberration as the different placement of pictures. 1Made from acrylic, convenient to clean and not easy to scratch glass and fish tank. 2The probe holder holds up to two probes simultaneously. 3The maximum fixing thickness for glass thickness is 1.5cm. 4It can be installed in your aquarium and filter tank. 5High quality and brand .