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Bosch Professional

IP ratings and drop tests, and one figure they keep leaving out

The professional line is the only brand on this site that treats survival as a published specification.

What it is genuinely good at

Enclosures. The GLM 40-31 states IP 65 and a 1.5 m drop onto concrete; the GTC 12V-450-13 thermal camera states IP54 and 2 m; the GMS 120-27 detector states IP 54 with a shock-absorbing housing. No other brand here publishes those numbers at all, and they are what separates a tool that lives in a bag from one that lives in a drawer.

Where it is ordinary

Accuracy figures. The GLM 40-31 distance meter, the GTC thermal camera and the GMS detector all omit the number that governs what they are for — while the cheaper consumer Bosch tools publish theirs. That is the recurring criticism of this brand across our reviews, and it is the same one every time.

The one to look at first

The GMS 120-27 detector, for the LED ring around the marking hole. It is the only detector here that puts the indication where the pencil goes.

Every Bosch Professional product we have reviewed