Sight Lights from Swaygo Gear Cave surveying just got easier! A revolutionary, efficient and simple solution to the problem of lighting surveying instruments. Say goodbye to the acrobatic balancing act when holding a light and a compass. Simply hold the Sight Light equipped survey instrument up to your headlamp for a few seconds and it will glow bright enough and long enough to easily read the dial. One-handed shots! Why didn't we think of this sooner!? Sold in pairs. Fits Suunto Tandems, compasses (KB-14) and inclinometers (PM-5). Easy to install with clear packing tape (not included).