For gun tinkerers, a trigger pull gauge is a valuable tool. Wheeler Engineering has a digital gauge that is folding, compact and comes in a foam-lined case. The gauge tests trigger weights from 0 to 12 lbs. and has a 0.5 percent accuracy rating. The digital readout displays three modes: minimum and maximum, average and live readings. Price: $80. Contact: Battenfeld Technologies, Inc.; (573) 445-9200; wheelerengineering.com.