The PM1 series of Power Meter are designed for use with an Optical Source for performing optical loss measurements on fiber optic cables. PM1 series are designed for the low budget. It can meet the the basic demand in real testing. With the smaller size and weight, it is easier to take in real testing. Download Spec Sheet: PM-102B Power Meter PDF Spec Sheet Specifications: PM-102A PM-102B Wavelength (nm) 850/1300/1310/1490/1550/1625 Connector FC/PC, SC/PC, ST/PC, Universal Detector Type InGaAs Accuracy + 0.35 dB + 10nW Resolution 0.01dB Linearity + 5% Auto Power Off Yes Back-light Yes Reference Value Yes Measuring Range (dBm) -60 to +3 -40 to +23 USB Interface N/A Data Storage N/A Wavelength Recognize N/A Tone Detection (Hz) N/A Operating Temperature -10 to +50 Storage Temperature -20 to+70 Power Supply 2pcs *Li-ion Battery ; 5V AC/DC Adaptor Dimension (mm) 115L*62W*30H Net Weight 140g Standard Accessories: Carrying Bag User Manual Worldwide compatible AC/DC power adaptor Test report Optional Accessories: E2000 Adaptor LC Adaptor 2.5mm Universal Adaptor 1.25mm Universal Adaptor Aluminum Carrying Box