Aoderda’s Professional Digital Trigger Gauge is the perfect tool for target shooters, gunsmiths and hunters who want to adjust trigger pull weight in precise increments. Color: Silver Item Weight: 2.5 ounces (70g) ShippingWeight: 3.4ounces ItemDimensions: 5.9 x 2.16 x 1.18 inch (15 x5.5 x 3 cm) Maximum Measure: 110lbs/50kg Material: ABS + Stainless Steel Shell Power: 2032 Button Battery(Included). Measure step 1.Press the power button 2.Hold 3 secs after choose the unit,switch the modes,We always choose “P”(PEAK LOCK MODE),that display the peak weight, but “C”(HODE MODE) will display the hold weight. 3 Hook the the trigger of the gun with the hook.You can read two units (KG and LB) separately. 4.Press the round key 1 seconds,the scale will recovery “0.0”.