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DT-121 DIGITAL MULTIMETER Ï Features frequency ( Hz) measurement, duty ratio * 2 measurement, and relative-value measurement functions. Max. readout 4000 count Sampling rate 3 times/ sec. Power supply Coin battery CR2032 × 1 Battery life Approx. 150 Hrs. Auto power OFF 15 minutes Outer dia. 56 ( W) × 11.5 ( H) × 108 ( D) mm Weight 50 g Accessory: Carrying case DT-121-TA DIGITAL MULTIMETER ( with calibration certificate) * Because the certificate will bear the purchaser' s name ( company name, etc.) , your name is required when ordering. Function Range Accuracy Internal resistance DC voltage DCV 400.0 mV ± ( 0.7% rdg 3 dgt) 100 M© or higher 4.000 V ± ( 1.3% rdg 3 dgt) Approx. 11 M© 40.00 V Approx. 10 M© 400.0 V 500 V AC voltage ACV 4.000 V ± ( 2.3% rdg 10 dgt) Approx. 11 M© 40.00 V Approx. 10 M© 400.0 V ± ( 2.3% rdg 5 dgt) 500 V Resistance © 400.0 © ± ( 2.0% rdg 5 dgt) 4.000 k© 40.00 k© 400.0 k© 4.000 M© ± ( 5.0% rdg 5 dgt) 40.00 M© ± ( 10% rdg 5 dgt) Capacitance F 4.000 nF ± ( 5.0% rdg 25 dgt) 40.00 nF ± ( 5.0% rdg 10 dgt) 400.0 nF 4.000 ¼ F 40.00 ¼ F ± ( 10% rdg 15 dgt) 200.0 ¼ F Frequency Hz 9.999 Hz ± ( 0.7% rdg 5 dgt) 99.99 Hz 999.9 Hz 9.999 kHz 99.99 kHz DUTY* 2 0.1 to 99% Continuity test Ï Audible at approx. ( 10 to 120 © ) or less Diode test Open voltage: approx. 1.5 V * 2 The duty ratio ( DUTY) is the ratio of the pulse width and pulse repetition period, and is expressed by percentage.