Yoke VIS-721 Visible Spectrophotometer is an economical analytical instrument with optional RS232 interface output. Its excellent photometric accuracy is higher than that of other instruments of the same class. It is widely used in medical testing, food, petrochemical industry, environmental protection and monitoring and many other fields.
1. Digital display of measured value.
2. Automatic zero adjustment and automatic hundred adjustment.
3. The large sample chamber can accommodate 5-100mm cuvettes.
4. The RS232 output port is optional, which can realize the function of connecting to a printer and a computer.
5. The original imported tungsten lamp is used to ensure the service life of the instrument.
6. The instrument adopts advanced microcomputer processing technology and is easy to operate.
7. The automatic light gate ensures the service life of the photoelectric sensor and makes the instrument test easier.

Key Name Key Function Description
【MODE】A/T/C/F mode switching key
【PC】Print/online send data key
【↑/0%】Input data in C/F mode to increase/adjust 0% T key
【↓/100%】Input data in C/F mode to decrease/adjust transmittance to 100%T or absorbance to 0.000ABS key
Key function description
A: Measure the absorbance of the sample
T: Transmittance of the measured sample
C: Enter the F value to measure the concentration, or use the standard solution to calculate the F value
F: Enter the F value to measure the concentration
| 721 (721-100) | 722 (N/S) | 752N (N/PC) | |
| Wavelength range | 350nm~1020nm | 320nm~1020nm | 195nm~1020nm |
| Wavelength Accuracy | ±2nm | ±2nm | ±2nm |
| wavelength repeatability | ≤1nm | ≤1nm | ≤1nm |
| Spectral bandwidth | 6nm | 5nm | 4nm |
| stray light | ≤0.3%T(at 360nm) | ≤0.3%T(at 360nm) | ≤0.3%T (at 220, 360nm) |
| Transmittance measuring range | 0.0%T~199.9%T | 0.0%T~199.9%T | 0.0%T~199.9%T |
| Absorbance measurement range | 0.000A~1.999A | 0.000A~1.999A | 0.000A~1.999A |
| Transmittance Accuracy | ±1.0%T | ±0.5%T | ±0.5%T |
| Transmittance repeatability | ±0.5%T | ±0.2%T | ±0.2%T |
| stability | ≤0.5%T/3min | ≤0.5%T/3min | ≤0.5%T/3min |
| noise | 0.3%T | 0.3%T | 0.3%T |
| bright current | ≤0.5%T/3min | ≤0.5%T/3min | ≤0.5%T/3min |
| receiving element | photocell | photocell | photocell |