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2. Check the surface of tube. (It should be no bubbles, no scabs, no thread like things.)
3. Warming instrument according to §184.108.40.206 ～§220.127.116.11 and set the wavelength at 360 nm.
Spectral Slit width：12nm
Photometry Accuracy：±2%(T) (tube), ±0.5%(T) (cuvette)
Voltage Requirements：220V±10% or 110V±10%
Photometry Range：0.0～199.9%(T) -0.3～2.999 A
1～9999 F 0～9999 C
Interface：RS232 serial & parallel interface
Generally the round test tube is not for optic purpose unless it is pre-checked strictly.
We can select it as follow:
1. Check size. (The size should be f12+0.4×75mm)
4. Pour some pure water into tube and insert it to the test tube well in sample apartment. Check it just as §18.104.22.168. Then put some mark on the tube opposite the white mark at the instrument.
5. Put the other test tube into instrument one by one and get the readout for everyone and put mark at everyone. We can divide them in many groups. In each group the differential of readout for every tub is less then ±0.02A.
6. Then we can use tubes in same group for blank, sample, and standard solution needn’t check the tube every time.
We offer various spectrophotometers, It enjoys a good reputation in the Chinese domestic market,parts of products are exported to more than 15 countries in Europe, America and Africa,include of S20 series visible spectrophotometer,S50 series UV-VISIBLE spectrophotometer,F90 series fluorescence spectrophotometer and S410 NIR spectrophotometer.