For the standard parts of external calibrated digital thermometers, the calibration conditions do not cover the use range (only 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃); the thermometers used for spare parts are not calibrated; the oven (used for cultivating microorganisms, the microorganism is suitable for the growth temperature of 35 ℃) is calibrated one point at a time, and the calibration temperature of 39 ℃ does not cover the use range.<br>
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