Lenmar WCCR2032 CR2032 Lithium Coin Battery: * Fits: Calculated Ind. Construction Master IV 4045, Calculated Ind. Construction Master Pro-Desktop, Calculated Ind. ElectriCalc Lt, Calculated Ind. ElectriCalc Pro, Calculated Ind. Frame Master II, Calculated Ind. GradeMatic 4000, Calculated Ind. Measure Master Classic, Calculated Ind. NautiCalc Plus, Calculated Ind. Qualifier Plus IIIFX--Desktop, Calculated Ind. Time Master II, Canon F-710, Casio FX-9750GPLUS, Garmin Nuvi 850 * Replaces: Hewlett Packard HP33S, Panasonic CR2032Seiko SBT15, Sony CR2032, Timex NA * 3V/220mAh * Lithium