Battery and antifreeze testers are hand held refractometers designed for the indication of specific gravity, freezing point temperature, and battery charging levels. The test requires one or two drops of sample on prism surface to read propylene glycol (-60 to +32°F), ethylene glycol (-84 to +32°F), or battery fluid (1.100 to 1.400 SG). Battery fluid scale also shows conditions such as recharge, fair, and good. It includes adjustable knob for calibration and rubber eyepiece guard.

A battery charger is a device used to put energy into a cell or (rechargeable) battery by forcing an electric current through it. The charge current depends upon the technology and capacity of the battery being charged. This device is plugged into an electrical outlet and connected to the two terminals of the battery to restore the state of charge in the battery. One of the leads coming from the charger is red and the other is black. The red lead is clamped on the positive post of the battery while the other is clamped on the frame of the vehicle. There are different types of battery chargers they are simple chargers, timer based chargers, intelligent chargers and USB based chargers.

Battery Controllers are available in ranges of 12 to 80 VDC for most types of commercial batteries. These are designed for all types of vehicles that cater for an auxiliary battery. They also has LED indicator.

Battery Ground Fault Tracer is an economical, manually balanced instrument that identifies tracks and locates ground faults in ungrounded dc battery systems-on-line. It is particularly effective in high electrical noise environments, as the strength of the test current can be adjusted. It accelerates fault location by eliminating trial-and-error procedures and because faults can be located without going off-line. It is particularly useful in any industry where supply of power for operating measurement, communication and control equipment is critical. It consists of a line-operated transmitter and a portable, battery-powered receiver, determines fault magnitude and severity. The transmitter connects to the battery bus and station ground.

A portable power tool for forming wire wrap type connections includes an electric motor, a torque transmitter. It also have casing for enclosing the electric motor and the torque transmitter. The battery pack mounts have both rechargeable and non-rechargeable batteries so that the battery pack may not be recharged when non-rechargeable batteries are contained within the battery pack.

Beamsplitters is an optical device that splits a beam of light in two. The intensity distribution among the beams will depend on whether a reference-beam or a dual-beam system is required. It is partially reflecting and transmitting mirrors. They can be made with an extremely thin film of metal or with a stack of thin films. The reflectance and transmittance of thin metal films is almost flat over the visible wavelength range. Polarizing beamsplitters reflect a large percentage of the S polarised beam while transmitting the P polarized beam. It is widely used in stereo photography to shoot stereo photos using a single shot with a non-stereo camera. The device attaches in place of the lens of the camera.

Belt drive motor is an electric motor that has an attached sprocket with a series of teeth. The sprocket teeth extend outward and are evenly spaced to interface with the drive chain. The drive chain is a closed-loop chain that has a series of links. The drive chain is rounded over the drive motor sprocket teeth. When the drive motor turns the sprocket, the drive chain automatically pulled forward.

Bimetallic lug is used to make connections with a cable and is fitted at the end of the cable. This lug is made of 99.9% purity copper and 99.5% purity aluminum. The barrel is friction welded to the palm so that the best possible transition between copper palm and aluminum barrel. To avoid oxidization of the aluminum barrels capped are greased.

Binder Connectors are for stereo mic input and there is a 1/8″ stereo jack for line input. The binder connectors are wired for phantom power or 3V and have a non-defeatable limiter.