TM 10-6640-215-13 SECTION III.  BASIC ISSUE ITEMS - continued 223 TM 10-6640-232-13&P EA 1 OXYGEN STABILITY BATH 224 TM 10-6670-278-13&P EA 1 HARVARD TRIP BALANCE 225 TM 10-6685-365-13&P EA 1 PRESSURE RECORDING GAGE 226 TM 10-7420-210-13&P EA 1 5030 CALCULATOR 227 TM 10-7430-218-13&P EA 1 PORTABLE TYPEWRITER 228 MAT: Rubber, color, black EA 1 3 x 0.25 vds. (70485) M-9000-36 229 6630-01-115-2398 METER, CONDUCTIVITY: Battery EA 1 operated (Drawer K3) (23299) P/N 1152 230 METER, PH, CHEMTRIX: W/temp EA 1 compensation, solid state electronics, interchangeable battery, w/l 15V ac conversion kit (Drawer G5) (58485) Type 400 C-50 (1) Illus Number (2) National Stock Number (3) Description CAGE and Part Number (4) U/M (5) Qty Rqd