Fruit pH: The fruit pH was significantly affected by pre cooling treatment and harvest stages, while the interaction of field heat removal and harvest stages was not significant. Pre cooling treatment resulted in significantly lower fruit pH (3.76) as compared to 3.86 in control. The mean pH 3.58, recorded at breaker stage increased to 3.86 and 4.00, when tomato fruit were harvested at yellow and pink mature stages respectively. Since, the acidity of the fruit is due to various organic acids, that are consumed during respiration (Albertini et al., 2006), the acidity, thus, decreased with advancing maturity or increasing storage duration with a corresponding increase in fruit pH. (Moneruzzaman et al., 2009). Since pre-cooling decreases the rate of ethylene production and ripening (Reina et al., 1995), thus the mean pH was lower in pre-cooled fruits.