Fan Cart, weight: 0.5 lb., dimensions: 6in x 5in x 5in, two AA size batteries, propeller delivers a thrust of about 88mN, accelerating the cart at 0.4 m/s2
Ray box, simple, safe and sturdy source of projected light for many classic optics experiments, produces parallel convergent rays across a plane horizontal surface and the rays are intense enough to be traced in natural light. Built in solid aluminum extrusion casing, 100-240V 50/60 Hz
Kestrel DROP D2 Wireless Temperature & Humidity Data Logger, Dimensions: 2.4 x 1.8 x 0.9 in, Battery Type: User-replaceable, Logging Rate: 2 seconds to 12 hours, Storage Temperatures: -30 to 60 deg C, Compliance: CE certified, FCC, IC tested, RoHS, WEEE compliant
Liquid Propane Bunsen Burner, No-Tip Safety s with expanded base and easy carry handle. This is most economical. It lacks a flame stabilizer or throttle control, but it does have an air flow adjustment sleeve. It is available for Natural and LP Gas and is 6inch tall.