I .Technical parameters:
1.Stability: displayed number(transmittance measurement) drift is less than 0.7 % (A) , within 3 minutes after powering on for 20 minutes .
2.Sensitivity : Kλ≥3.4×10-3 , (testing in Potassium dichromate standard solution).
3.Repeatability : error ≤ 0.003 (A) , (testing in Potassium dichromate standard solution).
4.Linear error : Absorbance range : 0.1~0.3,linear error ≤±6% ;0.3~0.6 , linear error : ≤ ±4% ;0.6~0.8,linear error ≤ ±5%(testing in Potassium dichromate standard solution).
5.Power consumption : ≤ 5W .
6.Cultivate heating power : ≤ 100W .
II . Testing items :
1.Heavy metal in the food .
2.Pesticide residue in the food .
3.Nitrate and nitrite in the food .
4.Formaldehyde, sulfoxylate, Sulfur dioxide .