Estes Altimeter (EST2246)

One-piece fully assembled unit
Sophisticated and lightweight electronic payload for accurately
measuring your model rocket altitudes
4 digit LCD read out and displays in English or metric units
Accurately measures model rocket launch altituted from 0 - 9999 feet
(0 - 3000 m)
Store up to 10 consecutive flight
Replaceable alkaline battery included

One Altimeter

Battery:
Battery Type: Alkaline
Voltage: 6V
Length: .630" (16mm)
Diameter: 0.394" (10mm)
Weight: 0.15oz (4.3g)
Terminals: Flat

Equivalent batteries that can be used in this altimeter include;
VINNIC: L1016
DURACELL: MN11, MS11, CA21, CX21A, WE11A
EVERREADY: A11, AG11, A11BP, E11A
RADIO SHACK: ALK11A
GOLD PEAK: GP11A

Due to small parts that could cause a choking hazard please keep
away from children 3 years of age and younger

For your safety and enjoyment, always follow the NAR Model Rocketry
Safety Code while participating in any model rocketry activities