H-B Enviro-Safe Dry Block/Incubator Liquid-In-Glass Thermometer; 24 to 57C, 35mm Immersion, Enviro-Safe Non-Toxic Liquid Fill (B60510-0000) Temperature range: 24 to 57C; divisions: 0.5; length: 175mm; immersion length: 35mm (1.4 inches); accuracy: 0.5C Thermometer fill type: organic; glass type: white back Incubator thermometer is individually serialized