JANDEL ENGINEERING LTD. manufactures the Compact probe to be compatible with Alessi and Veeco machines including the Veeco FPP-100 and FPP-5000. Also, GRQ Instruments and other systems that use the square bodied probe. It is 0.75″ x 0.625″ x 1.475″ high (19mm x 16mm x 37.5mm high) and weighs 18g.