Mantis Composting Kit (moisture meter and thermostat combo) 201108 (Discontinued by Manufacturer) ComposT-Twin Compost Kit - Moisture Meter & Thermometer Value Combo Pack For maintaining optimum conditions for decomposition in your compost Moisture meter lets you know whether your compost needs water Thermometer helps you maintain higher temperatures for faster decomposition 11 by 2 by 1.5 inches