CALIBRATOR The CL-355A is a small, lightweight, portable dry block calibrator, that offers fast heat-up and cooldown times with excellent performance specifications at a wide operating temperature range. It’ s a good choice for standard bench lab work or as a portable field unit. The unit covers the temperature range from 5° C ( 9º F) above ambient up to 400° C ( 752º F) using a large multi-well machined aluminum insert block as the heat transfer medium to the sensors under test. The CL-355A uses the same aluminum inserts as the CL-740A calibrator. This calibrator is designed to work safely under the following conditions: ambient temperature range: 5 to 40° C ( 9 to 104° F) , up to 95% relative humidity, non-condensing. SPECIFICATIONS Minimum Temperature: 5° C ( 9° F) above ambient Maximum Temperature: 400° C ( 752° F)  Cooling Rate, 400 to 100° C( 752 to 212º F) : 21 min Heating Rate, 20 to 400° C( 68 to 752º F) : 12 min Independent Over-Temperature Cutout: 450° C ( 842º F) approx. Fan Cooling: Automatic Display Resolution: 0.1°  Weight: 4 kg ( 9 lb)  Insert Immersion Depth: 4.5 Dimensions: 222.25 H x 203.2 W x 203.2 D mm( 8.8 x 7.9 x 7.9 " )  Stability After 15 Min: : ± 0.15° C ( ± 0.27º F)  Display Accuracy: : ± 0.6° C ( ± 1.1º F)  Well to Well Uniformity: 0.015 to 0.025° C( 32.02 to 32.04º F)