Products JW3208 self-calibration handheld optical power meter for the installation, operation and maintenance of fiber optic network specifically designed for a precise, durable and convenient portable test instrument. A smart appearance, the selectable switch the backlight, automatic shutdown function, ultra-wide range of optical power test, accurate test precision and new user self-calibration function and a common interface design. The product attributes meter Model JW3208A JW3208C wavelength range (nm) 800 to 1600 probe type InGaAs Measurement Range (dBm) -70 ~ +3 -50 ~ +26 Uncertainty ± 5% standard wavelength (nm) 850,980,1300 the 1310,1490,1550 display resolution linear display: 0.1% of the number of display: 0.01dBm Operating Temperature (℃) -10 ~ +60 Storage Temperature (℃) -25 ~ +70 automatic shutdown time (min) 10 battery time (h) 240 Dimensions (mm) 152 × 74 × 26 power 3 AA 1.5V battery Weight (g) 200 Other Description Model Type A Type C User's Manual a product warranty card, a certificate of a AA1.5V three alkaline batteries clean swab a desiccant an Oxford cloth soft pack a trading asking price welcome new and old customers come to order.