GEMM offers a wide range of retarder prover cabinets, tables and freezers specifically realized for different sectors: discover all our products for pastry laboratories, bakeries, and pizzerias. Retarder prover cabinets are fundamental appliances to manage and control the leavening cycle for all the professionals who work in bakeries, pastry laboratories and pizzerias. RETARDER PROVER CABINET 40 TRAYS – NEGATIVE – Retarder-prover cabinet for 40 600×400 trays, electronic humidity probe for humidity control.