released a commercial in which an ice hockey player used the DW-5000C as a hockey puck to demonstrate the toughness of the watch. The commercial gained negative publicity and Casio was accused of false advertising. A TV news channel then set out to conduct live tests on the DW-5000C to check whether it was as tough and durable as advertised. This involved repeating the action shown in the commercial. The DW-5000C survived the impact of the hockey stick, and the G-Shock gained popularity among the general public. The popularity of G-Shocks increased throughout the 1990s. By 1998, Casio had released more than 200 different G-Shock models, with worldwide sales at 19 million units. In 1985, Casio released the DW-5500C, which was the first G-Shock to feature a mud-resistant structure. Called the G-Shock-II due to the new construction feature, it was nicknamed "Mudman" by collectors due to its mud resistance capabilities. Casio would then go on to release a mud-resistant line of watches in 1995 which would go on to be called Mudman. In 1989, Casio introduced the AW-500, which was the first G-Shock featuring an analog display with a digital sub display at the 6-o'clock position. In 1992, Casio released the DW-6100 equipped with a temperature sensor thus making it the first G-Shock to be equipped with a sensor. The watch also featured a resin (plastic) case instead of the original stainless steel case of earlier models for improved shock resistance. This move would transition into most of the models in the subsequent years with the original G-Shock square design also adopting the same construction. By the early 2000s, the G-2000 model marked the last standard G-Shock to use a stainless steel case, leaving only a few speciality models in the line-up featuring the traditional metal case construction. In 1993, Casio introduced the DW-6300 Frogman, which was the first ISO 6425 certified diver's watch in the G-Shock lineup. The Frogman also marked the start of the MAN or "master of G" line of G-Shocks which was used to introduce new features and functions in the G-Shock lineup. Notable watches which introduced such features are as follows: DW-8600 Fisherman (1996): First G-Shock having a tide-graph and moonphase feature. This model was a precursor to the more popular Gulfman series first introduced in 1998. DW-9300 Raysman (1998): First G-Shock to have tough solar battery recharging technology. DW-9800 Wademan (1999): First G-Shock with