Starting a thread where people can post Gizmos, Electronics, Mechanical, Electrical, Juggads that made your RCing better and efficient. Post it with pics, Website Links, how it improves your Jig/Rig what was your experiences with it or what do you expect out of it. Don't assume people know this equipment that you post, newbies dont 

I'll start off with the simplest one.

The multimeter. Without one, an RCer is pretty much handicapped. It's a great tool to avoid shorts, check solder joints apart from it's other standard uses.

http://en.wikipedia.org/wiki/Multimeter

JR MatchBox



Ultra Precision Servo Matching System & Power Distribution System
JR's MatchBox lets you synchronize the neutrals, endpoints and reversing of up to 4 servos from a single receiver channel, power them with their own dedicated battery pack and cut your setup time to mere minutes.

Until digital servos came along, driving a single control surface with 2 or more servos wasn't all that difficult. If they fought each other a tiny bit, it wasn't the end of the world.

But when ganged digital servos aren't perfectly matched – or if horn geometry is slightly off – look out. Current drain can soar and surfaces strain as each servo battles to hold its position.

Enter, the MatchBox. Besides offering convenient servo matching, MatchBoxes can reduce the need to multi-channel mixing, prevent voltage drops to the receiver, and even eliminate the use of second receivers as nothing more than expensive bus bars. Which all adds up to a list of benefits programmable servos alone simply can't deliver.

Functions
The various functions of the MatchBox are accessible through the rotary dial as follows:

0: On. In this position, all settings remain stored. The INCR+ and DECR- buttons are not active. The MatchBox should always be kept in this position for normal operation.

1-4: In these positions, servo Neutral and End Point Adjustments (EPA) can be accessed and adjusted for each servo by using a combination of transmitter stick positions and the INCR+ and DECR- buttons.

5-8: In these positions, Servo Reversing can be accessed and adjusted for each servo by using a combination of transmitter stick position (neutral), and the INCR+ and DECR- buttons.

9: In this position, the values of the MatchBox can be returned to the factory default settings.

The Rotary Dial is coordinated to the servos as follows:

1/5: This is the port for the 1st servo. Position 1 adjusts neutral and End Point Adjustments (EPA). Position 5 adjusts the servo reversing for this servo.

2/6: This is the port for the 2nd servo. Position 2 adjusts neutral and End Point Adjustment. Position 6 adjusts the servo reversing for this servo.

3/7: This is the port for the 3rd servo. Position 3 adjusts the neutral and End Point Adjustments (EPA). Position 7 adjusts the servo reversing for this servo.

4/8: This is the port for the 4th servo. Position 4 adjusts the neutral and End Point Adjustments (EPA). Position 8 adjusts the servo reversing for this servo.

Product