Water Bath Precision construction as per models but with glass windows on both opposite for observation temp controlled by mercury contact thermometer with a sensitivity of 0.2 °c suitable for precision laboratory activities requiring constant temp with high degree of accuracy complete with stirrer with speed control regulator workable on 220v ac 50 hz single phase.chamber size in mms & inchesa) 425x 250x 225 (17” x 10” x 9”)b)450x 375x 375 (18” x 15” x 15”)c) 600x 450x 450 (24” x 18” x